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GRE version number zero Protocol: By default, only a minimal header of four bytes will be included. The tutorial I've used most when trying this is herebut I have tried multiple methods and different tutorials, and am continuously met with the same problem.
So, adding -p ipencap fixed the issue This page was last edited on 22 Novemberat Kam guest February 27, at 8: Evan Anderson k 14 Are you sure your firewall rules allow for the request to be received by HostB? Views Read Edit View history. Kam, I think there is support for GRE on most router platforms and they don't have problems when it comes to speed.
I am trying to forward packets tunnrl HostA to HostB using ip-in-ip tunneling.
Retrieved from " ipimip 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. Most transport will expect an MTU of Ideally I would like a matrix:.
GRE vs IPIP Tunneling
If you want to slap that into the answers box I'll mark it as accepted. Tunnel key optional Sequence Number: Thanks for the informative article. But this can be handled by maintaining the tunndl state of the tunnel.
GRE on most platforms is in software right? The protocol field of the outer header is set to 4 for IPv4 or 41 for IPv6. If the packet size is greater than the Path MTUthe packet is fragmented in the encapsulator, as the outer header should be included.
tunel Instead it should discard the datagram. Alexandra Stanovska guest February 28, at 2: In - I pick any packet type to be encapsulated Out - I pick what packet type tunmel should be encapsulated in At node 2: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.
RFC - IP in IP Tunneling
The outer header TTL is set to value ipiinp that the datagram is delivered to tunnel end point. The inner header TTL is decremented before encapsulation and is not changed in decapsulator. If this bit is set to 1 in the thnnel header, then the outer header also have this bit set to 1 saying that this datagram cannot be fragmented.
I am wondering if you could direct me to some type of open source code that would allow me jpinip encapsulate one packet type within another - either using GRE or IP-in-IP - I would like to look at both otpions. While doing this, the inner packet is unmodified except the TTL field, which is decremented.
Sign up using Facebook. Yep IP-IP can be very useful. Otherwise you'll end up with some funky MTU issues to troubleshoot. More cool stuff networking-forum.
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