GRE header size

Generic Routing Encapsulation - Wikipedi

  1. Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links or point-to-multipoint links over an Internet Protocol network
  2. The GRE header is 4 bytes, and the outer IP header is 20 bytes, so we need take the MTU of our real interface (commonly 1500), and subtract 24 bytes. This leaves us with an MTU of 1476. Then, we want to adjust our MSS. This is used to help devices in the entire path to adjust their size to avoid fragmentation
  3. GRE Header The 4-16 byte header is placed between the deli very and payload headers. At least, the GRE header stores the GRE version and payload protocol type. Optionally the GRE header can store a packet checksum, a tunnel key and packet sequence number. Payload header This is the inner or encapsulated header
  4. GRE adds two headers to each packet: the GRE header, which is 4 bytes long, and an IP header, which is 20 bytes long. The GRE header indicates the protocol type used by the encapsulated packet. The IP header encapsulates the original packet's header and payload
  5. e if a particular GRE packet or set of packets has arrived at the remote end of the tunnel
  6. Some protocols have additional options, e.g. if you click Ethernet, you will see VLAN and QinQ header option checkboxes. For example, if you want the TCP MSS for IPv6 in GRE over IPv4, click: IPv4, GRE, IPv6, TCP. Header sizes for VXLAN, LISP, and WireGuard include UDP, and STT includes TCP, because these protocols never use another L4 protocol
  7. Normal Packet = 66 bytes (including 6 bytes of MLPPP - L2 Header) GRE tunnel overhead = 24 bytes + 6 (L2 ethernet header) Total GRE tunnel = 24 + 6 + 66 = 96 bytes i.e. 30 bytes extra w.r.t normal packet

GRE packets are formed by the addition of the original packets and the required GRE. headers. These headers are 24-bytes in length and since these headers are added to the. original frame, depending on the original size of the packet we may run into IP MTU. problems. Even though the maximum IP datagram has been defined as 64K, most links. For most Ethernet networks this is set to 1500 bytes and this size is used almost universally on access networks. Ethernet Version 2 networks have a standard frame size of 1518 bytes (including the..

GPRS Tunnelling Protocol (GTP) is a group of IP-based communications protocols used to carry general packet radio service (GPRS) within GSM, UMTS and LTE networks. In 3GPP architectures, GTP and Proxy Mobile IPv6 based interfaces are specified on various interface points.. GTP can be decomposed into separate protocols, GTP-C, GTP-U and GTP'.. GTP-C is used within the GPRS core network for. RFC 2784 Generic Routing Encapsulation March 2000 3.1.Forwarding Decapsulated IPv4 Payload Packets When a tunnel endpoint decapsulates a GRE packet which has an IPv4 packet as the payload, the destination address in the IPv4 payload packet header MUST be used to forward the packet and the TTL of the payload packet MUST be decremented

Resolve IPv4 Fragmentation, MTU, MSS, and PMTUD Issues

Ethernet MTU is generally 1500 bytes. When using GRE, however, the additional header has an overhead of another 24 bytes that needs to be taken into account. Therefore, when establishing a GRE tunnel with a symmetric traffic flow, we recommend setting the MTU to 1400 bytes, as shown in the above example Because the firewall encapsulates the tunneled packet in a GRE packet, the additional 24 bytes of GRE header automatically result in a smaller Maximum Segment Size (MSS) in the maximum transmission unit (MTU). If you don't change the IPv4 MSS Adjustment Size for the interface, the firewall reduces the MTU by 64 bytes by default (40 bytes of IP header + 24 bytes of GRE header) Decrease the MTU size that goes over the GRE tunnel specifically so that the limit is not reached when GRE adds its header It seems like the link I am using for reference decided to go with option 2. In that case, why don't we just adjust the MTU size for the device overall to be bigger RFC 2890 Key and Sequence Number Extensions to GRE September 2000 packet reordering in the network by buffering. 3.Security Considerations This document describes extensions by which two fields, Key and Sequence Number, can be optionally carried in the GRE (Generic Routing Encapsulation) Header [].When using the Sequence number field, it is possible to inject packets with an arbitrary Sequence. The ESP Trailer will usually vary in size. Its job is to ensure that the Pad Length, Next Header fields (both 1-byte long and contained within the ESP Trailer) & ESP Auth.Trailer are aligned on a 4-byte boundary. This means the total number of bytes, when adding the three fields together, must be a multiple of 4

GRE Tunnels - Network Directio

Generic Routing Encapsulation (GRE) Packet header The GRE packet header has the form: Flags and version (2 octets) The GRE flags are encoded in the first two octets. Bit 0 is the most significant bit, bit 15 is the least significant bit. Bits 13 through 15 are reserved for the Version field To allow for the 24-byte CNA GRE header, the final MTU in your IPsec configuration should be no greater than 1398. If you use ESP plus the IP Authentication Header (AH) protocol, the math works out to 1414 bytes minus the 24-byte CNA GRE header, for a final configured MTU of no more than 1390 bytes We can see a 1514 byte packet and a 82 byte packet being sent. The 1514 byte packet is the max that Cloud-2 can send so it sends the rest of the data in a second packet. The second packet consists of an IP header (20 bytes), a GRE header (4 bytes), an inner IP header (20 bytes), and 24 bytes of payload (our overflow from packet 1) Generic routing encapsulation (GRE) is an IP encapsulation protocol which is used to transport IP packets over a network. Generic routing encapsulation (GRE) was initially developed by Cisco, but later become industry standard (RFC 1701, RFC 2784, RFC 2890).Generic Routing Encapsulation (GRE) can tunnel any Layer 3 protocol including IP New protocol header (GRE) 4 bytes = Maximum segment size (MSS) 1436 bytes: Unless you apply these MSS settings at the origin, client machines do not know that they must use an MSS of 1436 bytes when sending packets to your origin

Three—the original IP header, the GRE IP header, and the IPsec IP header. Four—the original IP header, the GRE IP header, the IPsec IP header, and the outer IP header. What feature does GRE introduce that cannot be accomplished with normal IPsec? GRE increases the packet size so that the minimum packet size is easily met GRE tunnel adds a 24 byte overhead (4-byte gre header + 20-byte IP header). Note: GRE tunnel can forward only IP and IPv6 packets (ethernet type 800 and 86dd). Do not use Check gateway option arp when GRE tunnel is used as route gateway The 24 bytes of GRE header is added to each IPv4 fragment. Now the fragments are 1500 (1476 + 24) and 68 (44 + 24) bytes each. 4. The GRE + IPv4 packets that contain the two IPv4 fragments are forwarded to the GRE tunnel peer router

Advancements in L3 VPN over IP in the WAN

The second packet consists of an IP header (20 bytes), a GRE header (4 bytes), an inner IP header (20 bytes), and 24 bytes of payload (our overflow from packet 1). Added all together it gives you 68 and you can add in 14 bytes for the Ethernet header giving you 82 bytes total. So how do we fix this TCP data size. The 20 byte IP header and 20 byte TCP header are subtracted leaving the value 1460 as the value the clients and servers send to each other as the negotiated MSS. GRE encapsulation adds an additional 24 bytes to the original IP packet (4 byte GRE header + 20 byte IP header). The clients and servers are not aware of th

What is GRE tunneling? How GRE protocol works Cloudflar

IP header overhead - 20 Bytes. TCP header overhead - 20 Bytes. IPSEC header overhead - 56 Bytes. GRE header overhead - 24 Bytes. Examples: Max IP packet size before fragmentation with LTE. 1428 LTE MTU. 20 bytes for IP. 20 bytes for TCP = 1388 MSS . Max IP packet size before fragmentation with DMNR/LTE. 1428 MTU. 24 bytes for DMNR\GRE. 20 bytes. Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco that allows the encapsulation of a wide variety of network layer protocols inside point-to-point links.. A GRE tunnel is used when packets need to be sent from one network to another over the Internet or an insecure network. With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets. GRE for example adds an extra 24 bytes of header, effectively reducing the size of the data portion of the packet by that amount if you want to avoid fragmentation. Fragmentation and tunneling becomes somewhat complicated because a router that has a tunnel endpoint has two separate roles * the partial checksum is based on actual size: 94 * whereas headers should be based on MSS size. 95 */ 96: partial_adj = skb->len + skb_headroom - 97: SKB_GSO_CB->data_offset-98: * the GRE header. In the case of FOU/GUE we cannot because the: 148 * outer UDP header displaces the GRE header leaving us in a state: 149 * of limbo Ipdecap can decapsulate traffic encapsulated within GRE, IPIP, 6in4, ESP (ipsec) protocols, and can also remove IEEE 802.1Q (virtual lan) header. It reads packets from an pcap file, removes the encapsulation protocol, and writes them to another pcap file. Goals are

II, the GRE's next protocol type is 0x88BE with 8-byte ERSPAN header size, and for ERSPAN type III, the GRE's next protocol type is 0x22EB with 12-byte ERSPAN header size, if no optional subheader enabled. In this section we describe the basic ERSPAN proto-col header format along with its implementation in the Linux kernel Instead of using a UDP header and a VXLAN header, only a GRE header is used, reducing the frame size by a few bytes. The GRE header contains the unique protocol ID (0x6558) for NVGRE frames as well as a 24-bit virtual segment identifier (VSID), that, like VXLAN, can support up to 16M unique tenant subnets Four—the original IP header, the GRE IP header, the IPsec IP header, and the outer IP header. 5. What feature does GRE introduce that cannot be accomplished with normal IPsec? a. GRE increases the packet size so that the minimum packet size is easily met. b. GRE adds robust encryption to protect the inner packet This simple calculation is the result of removing a standard IP header size (20 bytes) from the maximum Ethernet payload of 1500 bytes. The use of WCCP with GRE guarantees some ip fragmentation will occur in default Ethernet configurations. This is because GRE adds 24 bytes to a standard Ethernet frame and WCCP adds an additional 4 bytes However the tunnel needs to add the GRE header, in this case an additional 28 bytes. The original packet is already at 1500 bytes (1460 payload, 20 bytes TCP, 20 bytes IP). So the tunnel interface needs to fragment the original packet into two packets just to fit the GRE header on

GRE, Generic Routing Encapsulatio

GRE adds a new IP Header (GRE IP Hdr) which means if we run IPsec in Tunnel mode we have 3 IP Headers (New IP Hdr and GRE IP Hdr are equal) versus the 2 IP Headers of running IPsec in Transport Mode. Transport mode does not use the GRE IP Hdr which saves 20 bytes overhead (This is the preferred encapsulation mode for GRE over IPsec) MikroTik RouterOS implements their own GRE IPv6 keepalive with inner GRE header's proto field set to 0x86dd. This have been implemented by us The Key (HW) Payload Length is the size of the payload excluding the GRE header. The Key (LW) Call ID is the Peer s Call ID for the session. The sequence Number is the standard implementation. The Acknowledge Number contains the sequence number of the highest numbered GRE packe t received by the sending peer for this session Total Length field of IPv4 header. The Total Length in IPv4 header is a 16-bit field which identifies the length (in bytes), of the IPv4 datagram.Total Length includes the length of IPv4 header and the Data it carries. The minimum-length of an IPv4 Datagram is 20 bytes (The minimum size of an IP header is 20 bytes and this is the case of an IPv4 header carrying no data) and the maximum is.

Windows Server 2016 provides updates to Generic Routing Encapsulation (GRE) tunnel capability for the RAS Gateway. GRE is a lightweight tunneling protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol internetwork • GRE tunnel adds 24 bytes to the IP Packet. 4 byte GRE header and 20 bytes new IP header is added; this increases MTU size of the IP packet. Careful planning on the interface MTU is necessary. Gre Tunnel Headers • GRE doesn't come by default with encryption so in order to encrypt the packet; IPSEC should be enabled over GRE tunnel active answers oldest answers newest answers popular answers 0 Well, it looks like your traces are broken. There is a GRE header with Protocol type set to 0x88be, but instead of a ERSPAN header following it there is Ethernet right away The GRE encapsulation process increases the size of the forwarded packet by 28 bytes. As a result, if the size of the encapsulated GRE packets are larger than the maximum transmission unit (MTU) of the network interface that will be used for forwarding the packet, the TCP/IP stack might need to perform fragmentation, creating two or more.

From 10.0R8 onward, the gre-tunnel parameter has been replaced by the ip-tunnel parameter together with a sub-parameter gre-header to identify this to be a GRE tunnel. In addition, the to ip-address parameter has been deprecated and replaced with the sub-parameter dest-ip VXLAN encapsulation expands the packet size to 50 bytes, which is shown as below. NVGRE uses the lower 24 bits of the GRE header as the TNI (tenant network identifier), which, like the VXLAN, can support 16 million virtual networks IFLA_GRE_OKEY for the Session ID. •Index is also configurable via iproute2. •COS and VLAN are extracted from original frame. •Truncate bit is set if: •Skblength is greater than device MTU + device hard_header_len •IPv4 length is greater than skblength -network header offset •IPv6 length is greater than skblength -transport.

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Here you can observe that we do not see any EIGRP hello packet in transit. As it is encrypted now we only see the ESP packet which got encapsulated over the GRE header. The Size of the packet is 158 bytes. You can see that right now we can observe the duplicity in the packet as the src and dst. In the GRE header as well as ESP header is same Starting in Junos OS Release 15.1, you can configure Layer 2 Ethernet services over GRE interfaces (gr-fpc/pic/port to use GRE encapsulation) Generic routing encapsulation (GRE) is a virtual point to point link that encapsulates data traffic in a tunnel . The below topics discusses the tunneling of GRE, encapsulation and de-capsulation process, configuring GREs and verifying the working of GREs Length of data (2 bytes): The length field in UDP represents the total size of each datagram, including both header and data. This field ranges in value from a minimum of 8 bytes—the required header size—to sizes above 65,000 bytes

Visual packet size calculator — Daniil Baturi

Solved: GRE tunnel overhead? - Cisco Communit

GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel. L3 GRE tunnel extends VLANs across Mobility Access Switches and Aruba controllers. GRE encapsulates Layer-3 frames with a GRE header and transmits through an IP tunnel over the cloud. Following figure shows how L3-GRE tunnel fits into network operations Linux kernel source tree. Contribute to torvalds/linux development by creating an account on GitHub (from comment) The overhead is only visible (and countable) outside the tunnel. Roughly you should see (outer packet header + GRE header) * number of packets more traffic on the outside (physical) interface than on the tunnel interface.. Depending on where you're watching, a physical interface might also be counting L2 traffic (add the L2 header size * number of packets), and additionally. The above packet structure shows GRE over IPsec in tunnel mode. GRE IPsec Transport Mode: In GRE IPsec transport mode, the GRE packet is encapsulated and encrypted inside the IPsec packet, but the GRE IP Header is placed at the front and it is not encrypted the same way as it is in Tunnel mode

bytes the packet is discarded if its size is less than 1280 bytes otherwise it is forwarded and encapsulated intact. GRE and IP-IP Tunnel Configuration To bind an IP/GRE or IP-IP tunnel to a private tunnel SAP, the ip-tunnel command should be added under the SAP. To configure the tunnel as an IP/GRE tunnel, the gre-header comman Total IPSec Packet Size 1548 The same with GRE: Field Bytes New IPv4 Header (Tunnel Mode) 20 SPI (ESP Header) 4 Sequence (ESP Header) 4 ESP-AES (IV) 16 New IPv4 Header (GRE) 20 GRE Header 4 Original Data Packet 1500 ESP Pad (ESP-AES) 10 Pad length (ESP Trailer) 1 Next Header (ESP Trailer) 1 Total IPSec Packet Size 158 The packet size plus the tunnel header size is calculated and checked against the tunnel MTU. For example, if the tunnel MTU is 1518 and the packet is 1526, the packet exceeds the tunnel MTU. If the tunnel MTU is 1518 and the packet is 1518, the packet will also exceed the tunnel MTU due to the addition of the tunnel header Size (bytes) Description. Encryption Coverage. Authentication Coverage. ESP Header. SPI. 4. Security Parameter Index (SPI): A 32-bit value that is combined with the destination address and security protocol type to identify the security association to be used for this datagram. See the topic on security associations for more details The default MTU size is 1500 bytes, tunnelling adds a 24-bit GRE header to the packet, adding IPSec later would also increase the size of the of the packet. To avoid issues with fragmentations of packets it is recommended to set the IP MTU to 1400 and TCP Maximum Segment Size (MSS) to 1360. R1: Hub (config)# interface Tunnel

It then fragments the delivery header and sends the resulting fragments to the GRE egress node, where they are reassembled. And: IPv4 Payloads. By default, if the payload is fragmentable, the GRE ingress node fragments the incoming packet and encapsulates each fragment within a complete GRE header and GRE delivery header We are only concerned with encrypting the interesting traffic flowing between the two peers. When securing the routing updates and routes isn't a requirement and the major concern is to encrypt the information/payload flowing between the peers we use IPSec over GRE. IPSec over GRE eliminates the additional overhead of encrypting the GRE header Set sequence number value. If field already exists (gre_basic_header::sequenceNumBit is set) then only the new value is set. If field doesn't exist it will be added to the layer, gre_basic_header::sequenceNumBit will be set and the new value will be set . Parameter Step 5 - The GRE header is decoded and the etype is copied into the frame header. The length of the remaining payload is updated in the frame template and the pointer is adjusted. Decap is called on the next header, which is IP. When the decap function inspects the IP payload it can go no further and just returns the frame template IP_GRE_ADDR The address family in the GRE SRE is not IPv4. 102C: 4140: IP_GRE_PROTO The protocol in the GRE header is not IPv4. 102D: 4141: IP_GRE_SIZE The GRE header in the buffer is incomplete. 102F: 4143: IP_BAD_TCP_LEN The packet length does not include the TCP header. 1030: 4144: IP_BAD_UDP_LEN The packet length does not include the UDP.

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Since GRE is an encapsulation protocol, the MTU and TCP MSS (Maximum Segment Size) have been reduced. This is an optimization, this step is not mandatory. By issuing the tunnel source command, the router will map the IP address of its Serial interface to the 'source IP' field of the GRE packet header 4. GRE Tunnel and MTU Issues. The maximum length of an IP packet can be 65 535 bytes. It includes 20 Bytes of IP header plus 65515 Bytes of payload. However the smaller size of IP packet is normally used on links depending on the type of layer 2 protocol. This length is set by the Maximum Transmission Unit (MTU) value If GRE is enabled (-disable-gre was not given to configure) 160 The length of the captured packet (starting from GRE header) is less than the length of a GRE header 161 There are multiple GRE encapsulations in the packet (currently not allowed) 162 GRE version in packet is not 0 or 1. 163 Flags in header are set that should be unset. 164 For.

Solved: GRE tunnel default MTU - Cisco Communit

Select the GRE Primary Key for the primary endpoint GRE header. The key should be the same at both ends of the tunnel. It is not mandatory for the key to be configured in the GRE tunnel. Select the Local Endpoint VLAN ID through which the AP will form a tunnel to the remote endpoint. The value must be between 0 and 4094 For what it's worth I tried to stripping 50 bytes off the header in the init-bar.bro file in the encap_hdr_size=50 line. That seems to be the magic number with this unusual erspan gre header size. After doing that, bro is recognizing and splitting all the logs out properly This is an 8 bit field. In Internet Protocol version 6 (IPv6) , this field is called the Next Header field. Note Values that are also IPv6 Extension Header Types should be listed in the IPv6 Extension Header Types registry at [IANA registry ipv6-parameters]. Available Formats CS Figure 32: PPP General Frame Format. All PPP frames are built upon the general format shown above. The first three bytes are fixed in value, followed by a two-byte Protocol field that indicates the frame type.The variable-length Information field is formatted in a variety of ways, depending on the PPP frame type.Padding may be applied to the frame, which concludes with an FCS field of either 2. Cisco IOS Next Hop Resolution Protocol (NHRP) - Denial of Service. CVE-36692CVE-2007-4286 . dos exploit for Windows platfor

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MTU Size Issues Network Worl

An overview of the fields in the IPv4 header. Using Wireshark to examine TCP/IP SIP packets Generic Routing Encapsulation (GRE) (RFC 2784, March 2000) (n^2) size to a more manageable size. This memo purposely does not address the issue of when a packet should be encapsulated. This memo acknowledges, but does not address problems such as mutual encapsulation [RFC1326]. GRE Header The GRE packet header has the form:. The GRE encapsulation overhead comprises 24 bytes (4 bytes for the GRE header, and 20 bytes for the inner IP header). TCP clients must use an MSS value of no more than 1436 bytes for GRE. This can often be achieved by using the MSS clamping feature of a firewall or router, to ensure that any TCP traffic sent down the GRE tunnel is limited to an. Since GRE is an encapsulating protocol, we adjust the maximum transfer unit (mtu) to 1400 bytes and maximum segment size (mss) to 1360 bytes. Because most transport MTUs are 1500 bytes and we have an added overhead because of GRE, we must reduce the MTU to account for the extra overhead The tunnel source is the outside interface tunnel mode gre multipoint ! The tunnel type: multipoint GRE tunnel key 101 Note: The MTU is set to 1400bytes due to GRE and IPSEC overhead , while the maximum TCP MSS is 40 bytes lower than the MTU (20 bytes IP header + 20 bytes TCP header)

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GPRS Tunnelling Protocol - Wikipedi

The second packet consists of an IP header (20 bytes), a GRE header (4 bytes), an inner IP header (20 bytes), and 24 bytes of payload (our overflow from packet 1). Added all together it gives you 68 and you can add in 14 bytes for the Ethernet header giving you 82 bytes total NOTE: Default MTU will be 1500 and over here we have changed to 1000. Now in the monitoring it can be observed as follows(MTU = 1000-24(GRE Header size)) In addition to the above tunnel types there are also SKB_GSO_GRE_CSUM and SKB_GSO_UDP_TUNNEL_CSUM. These two additional tunnel types reflect the fact that the outer header also requests to have a non-zero checksum included in the outer header

RFC 2784 - Generic Routing Encapsulation (GRE

GRE packet is encaped packet encapsulated, type=generic, len=108 >>> IP-GRE-header + Inner-IP ipid = 14829(39ed), @2d5db0fa going into tunnel 40000001. flow_encrypt: pipeline. chip info: PIO. Tunnel id 00000001 (vn2) doing ESP encryption and size =112 >>> ESP ipsec encrypt prepare engine done ipsec encrypt set engine done ipsec auth don Open Sites → [Site Name], and then LAN GRE Tunnels and click + to add a new tunnel. Enter a Name and select a Source IP from the list of configured Virtual IPs. Enter the tunnel's Destination IP and prefix (e.g., Click the Checksum checkbox if a checksum in the header is required Lets first map these values with the header '45' corresponds to the first two fields in the header ie '4' corresponds to the IP version and '5' corresponds to the header length. Since header length is described in 4 byte words so actual header length comes out to be 5×4=20 bytes. '00' corresponds to TOS or the type of service The total length of the MPLS header is 32 bits ( 4 bytes or octets ). The first 20 bits constitute a label, which can have 2^20 values. Next comes 3 bit value called Traffic Class. It was formerly called as experimental (EXP) field. Now it has been renamed to Traffic Class (TC). This field is used for QoS related functions If the body of a packet is smaller than or indivisible by block size, it is padded to match the block size. Examples: A 1-byte packet will become 16-bytes with 15-bytes of padding. A 1400-byte packet will become 1408-bytes with 8-bytes of padding. A 64-byte packet does not require any padding. IPsec headers and trailers

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What is GRE Tunnel GRE for Humans Imperv

In case no MTU value is found MSS with minimum size ( 576 ) will be send ( as you know MSS = MTU - layer3 header + layer 2 header ) . and MTU is maximum packet size an interface can support . The TCP Maximum Segment Size (MSS) defines the maximum amount of data that a host is willing to accept in a single TCP/IP datagram The Maximum Transmission Unit (MTU) is the maximum length of data that can be transmitted by a protocol in one instance. For example, the MTU of Ethernet (by default 1500) is the largest number of bytes that can be carried by an Ethernet frame (excluding the header and trailer) The only disadvantage of using GRE is the extra minimum of four bytes that will be used between CLNP header and IP payload packet. Given the large size of CLNP headers this will not make a significant difference to the performance of any network that has IP over CLNP PDUs present on it. 3. Transporting GRE packets over CLNS

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The VXLAN encapsulation increases the size of the packet by 50 bytes, as described below: In opposite to VXLAN, does not take advantage of a standard transport protocol (TCP/UDP), instead uses Generic Routing Encapsulation (GRE) as the encapsulation method. It uses the lower 24 bits of the GRE header to represent the Tenant Network. 2. Since the MTU of the GRE tunnel is 1476, the 1500-byte packet is broken into two IPv4 fragments of 1476 and 44 bytes, each in anticipation of the additional 24 byes of GRE header. 3. The 24 bytes of GRE header is added to each IPv4 fragment. Now the fragments are 1500 (1476 + 24) and 68 (44 + 24) bytes each. 4 GRE will copy the DF bit from the data IP header to the GRE IP header. If the DF bit is set in the GRE IP header and the packet will be too large after IPsec encryption for the IP MTU on the physical outgoing interface, then IPsec will drop the packet and notify the GRE tunnel to reduce its IP MTU size The IP MTU is always what you set it to on an interface, in this case 1476. GRE headers are only applied to the packets on GRE-enabled interfaces, so these packets will be 24 bytes larger than normal packets. so, if you didn't change the IP MTU, packets coming in on the GRE tunnel interface would be 1524

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