From: David Miller <davem@davemloft.net>
To: vladislav.yasevich@hp.com
Cc: netdev@vger.kernel.org
Subject: Re: on-link assumption in ipv4 routing cache
Date: Mon, 03 Nov 2008 17:32:07 -0800 (PST) [thread overview]
Message-ID: <20081103.173207.246539261.davem@davemloft.net> (raw)
In-Reply-To: <4900B8C0.5020205@hp.com>
From: Vlad Yasevich <vladislav.yasevich@hp.com>
Date: Thu, 23 Oct 2008 13:47:44 -0400
> Ok, I've found the code and the explanation, but I think there is
> a small bug here that's been around a very long time. There is absolutely
> no checking for the interface state. This means that if the interface
> is brought down, we are still going to attempt to route through it.
> That seems broken, since the interface was administratively brought down.
>
> I've actually tried to do this with my test app. I've set it to connect
> over a given interface, brought the interface down, and then issued the
> connect(). The result is that the app hung until tcp_syn_retries SYNs have
> been issued and then returned error.
>
> I've got no issues against on-link assumption as long as there are some smarts
> behind it. The least we could do is use a running interface.
I agree with you that this behavior is at best sub-optimal.
I'm happy to entertain patches the try to make this
area more sane.
prev parent reply other threads:[~2008-11-04 1:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-21 1:02 on-link assumption in ipv4 routing cache Vlad Yasevich
2008-10-21 5:13 ` David Miller
2008-10-23 17:47 ` Vlad Yasevich
2008-11-04 1:32 ` David Miller [this message]
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