Apr 12, 2020 Input Devices by admin

Post as a guest Name. Most cases the protocol will be IPv4 unless there is some additional headers for encapsulated packet. Packet checksum optional Key: GRE version number zero Protocol: I feel as though I’ve exhausted all of google. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Kam guest February 27, at 8:

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Kam, I think there is support for GRE on most router platforms tunel they don’t have problems when it comes to speed. The soft state information maintained by the tunnel includes the following:.

What am I missing? This page was last edited on 22 Novemberat Router config interface tun0 Router config-if tunnel mode?

Ip-in-Ip tunnel not working — Packets not being decapsulated Ask Question. If this bit is set to 1 in the inner header, then the outer header also have this bit set to 1 saying that this datagram cannot be fragmented.

This field is not copied from inner header. Additional GRE options can be turned on and off independently of one another: The inner header TTL is decremented before encapsulation and is not changed in decapsulator.


RFC – IP in IP Tunneling

Utnnel you’ll end up with some funky MTU issues to troubleshoot. Tunnel key optional Sequence Number: Now, when I ping After sending a datagram, there may be chances of encapsulator getting ICMP messages from intermediate nodes. Make sure your firewall rules allow for the request to be received by HostB and, obviously, the converse on HostA, too.

In gre setup, unless you enter a valid destination, the tunnel will not come up. While doing this, the inner packet is unmodified except the TTL field, which is decremented.

Of course, these features come at a cost of additional overhead; in cases where the extra capabilities of GRE aren’t needed, IPIP will do just fine. It’s always those pesky firewall rules. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Tunnnel up or log in Sign up using Google. Only switches may have problems when dealing with GRE tunneling, I think on most lower level switches it’s not even officially supported, and s are not very recommended to be used as tunnel termination points either. In this article, we’ll examine the operation of each, how they differ, and when each should be used.


But this can be handled by maintaining the soft state of the tunnel. Ethertype of the encapsulated protocol Checksum: So, adding -p ipencap fixed the issue ICMP echo request, idseq 69, length 64 ipip-proto-4 Tinnel incoming packets look like they should, but they are never being decapsulated.

GRE vs IPIP Tunneling

Ray Soucy guest March 6, at If you want to slap that into the answers box I’ll mark it as accepted. More cool stuff networking-forum. Retrieved from ” https: Sign up using Email and Password.

GRE version number zero Protocol: So the encapsulator will not be able to relay the appropriate message to the original sender. Ideally I would like a matrix: