ngrep not showing any content for IPv6 packets

Question

I'm using ngrep to see some HTTP traffic.

sudo ngrep -ld eth0 '.*' ip6 and port 80

But I don't see any output (other than # marks). If I do a similar test with IPv4, all works fine.

Any ideas?

Answer 1

ngrep 1.45 has a bug in it that effects IPv6. As per the discussion at,

There is a patch available, located at,

Which resolves this issue. In order to use this patch, you'll need to download the ngrep source and patch it with the command,

patch < ngrep-fix-ipv6-support.patch

If you then configure and install ngrep as normal you'll be able to see the content of IPv6 packets from ngrep.