netdev - Re: Issue with GRE tunnel, created with "local any" on kernel 3.14

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Date:	Thu, 31 Jul 2014 12:47:37 +0400
From:	Dmitry Popov <ixaphire@...tor.net>
To:	Sergey Popov <pinkbyte@...too.org>
Cc:	netdev@...r.kernel.org
Subject: Re: Issue with GRE tunnel, created with "local any" on kernel 3.14

On Thu, 31 Jul 2014 10:29:00 +0400
Sergey Popov <pinkbyte@...too.org> wrote:

> > I have no patch to fix this issue, but as a workaround, you can use 
> > ip tunnel change tun_test tos inherit.
> 
> Thanks, your workaround works as expected if tos value defined
> explicitly. Though, I do not understand why: iproute2 documentation says
> that default tos value in 'ip tunnel' command is already 'inherit'.

man ip-tunnel says default tos is 00, and that's true. If you're about *.tex
files under iproute2.git/doc, they are more than 10 years old, I doubt if they
are maintained. Otherwise I don't know where you found it.

This workaround works because setting tos=inherit disables tunnel route cache,
which is buggy in your release (it doesn't cache source address).

Btw, thanks for the report, David has accepted the patch today, commit
95cb574 (ip_tunnel(ipv4): fix tunnels with "local any remote $remote_ip"), so
I think next kernel releases will have it.

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