netdev - Re: 2.6.20.3-rc1 / iproute2 hoplimit 2^32-1 vs 2^8-1

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Date:	Mon, 19 Mar 2007 12:18:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	pekkas@...core.fi, netdev@...r.kernel.org
Subject: Re: 2.6.20.3-rc1 / iproute2 hoplimit 2^32-1 vs 2^8-1

From: Patrick McHardy <kaber@...sh.net>
Date: Mon, 19 Mar 2007 16:27:29 +0100

> Mhh actually this looks intentional:
> 
> icmpv6_send and some other output functions do:
> 	int hlimit;
> ...
>         if (hlimit < 0)
>                 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
>         if (hlimit < 0)
>                 hlimit = ipv6_get_hoplimit(dst->dev);

Yep, negative value has a specific meaning.

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