linux-kernel - Re: PROBLEM: Can ping address, but traceroute gets ENETDOWN

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Date:	Tue, 17 Jul 2012 15:55:39 +0200
From:	Paul Rolland (ポール・ロラン) 
	<rol@...be.net>
To:	Terry Phelps <tgphelps50@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, rol@...be.net
Subject: Re: PROBLEM: Can ping address, but traceroute gets ENETDOWN

Hello,

On Tue, 17 Jul 2012 09:41:27 -0400
Terry Phelps <tgphelps50@...il.com> wrote:

> On Tue, Jul 17, 2012 at 9:30 AM, Eric Dumazet <eric.dumazet@...il.com>
> wrote:
> > On Tue, 2012-07-17 at 09:04 -0400, Terry Phelps wrote:
> >> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
> >> setsockopt(3, SOL_IP, IP_MTU_DISCOVER, [0], 4) = 0
> >> setsockopt(3, SOL_SOCKET, SO_TIMESTAMP, [1], 4) = 0
> >> fcntl(3, F_SETFL, O_RDONLY|O_NONBLOCK)  = 0
> >> setsockopt(3, SOL_IP, IP_TTL, [1], 4)   = 0
> >> setsockopt(3, SOL_IP, IP_RECVERR, [1], 4) = 0
> >> connect(3, {sa_family=AF_INET, sin_port=htons(33434),
> >> sin_addr=inet_addr("192.168.118.22")}, 28) = 0
> >> sendto(3, "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"..., 40, 0, NULL, 0) = -1
> >> ENETDOWN (Network is down)

ENETDOWN should mean your interface is no more in the UP status.

Could it be you have some processes running that could turn down and up
your interfaces ? Anything in /var/log/messages about eth0 ?

Paul



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