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Issue #3575

Tunnel of IPv6 Over IPv4 not accespting Jumbo Packets

Added by Syed Imran about 1 month ago. Updated about 1 month ago.

Status:
Feedback
Priority:
Normal
Assignee:
-
Category:
-
Affected version:
Resolution:

Description

Tunneling of IPv6 over IPv4 work fine for me. But if i send a large packets say 2000 bytes, it reaches the destination but does not comes back using a simple ping command as below.

ping 10.131.224.111 -s 2000 --> this works
ping6 2003::52 --> this works
ping6 2003::52 -s 2000 --> this does not work

My configuration is available in this page - https://unix.stackexchange.com/questions/610575/how-to-enable-fragmentation-in-ipsec-tunnel-for-ipv6-over-ipv4
Not sure what i am missing.. I also tried adding MTU in ipsec configuration but did not help.

[root@sys-123 ~]# ipsec --version
Linux Libreswan 3.25 (netkey) on 3.10.0-1127.10.1.el7.x86_64

History

#1 Updated by Tobias Brunner about 1 month ago

  • Status changed from New to Feedback
  • Priority changed from High to Normal

Please don't cross-post. You should try to get PMTUD working (i.e. make sure ICMPv6 are not blocked) and if that doesn't work, you may have to manually reduce the MTU (either via route or interface, VTI/XFRMI could also be used), also see ForwardingAndSplitTunneling.

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