From: Stefan Rompf <stefan@loplof.de>
To: David Miller <davem@davemloft.net>
Cc: herbert@gondor.apana.org.au, simon@fire.lp0.eu,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: sockets affected by IPsec always block (2.6.23)
Date: Wed, 5 Dec 2007 19:42:31 +0100 [thread overview]
Message-ID: <200712051942.32264.stefan@loplof.de> (raw)
In-Reply-To: <20071204.231200.117152338.davem@davemloft.net>
Am Mittwoch, 5. Dezember 2007 08:12 schrieb David Miller:
> Actually, consider even a case like DNS. Let's say the timeout
> is set to 2 seconds or something and you have 3 DNS servers
> listed, on different IPSEC destinations, in your resolv.conf
>
> Each IPSEC route that isn't currently resolved will cause packet loss
> of the DNS lookup request with xfrm_larval_drop set to '1'.
>
> If all 3 need to be resolved, the DNS lookup will fully fail
> which defeats the purpose of listing 3 servers for redundancy
> don't you think? :-)
In your example, the DNS server might actually stop responding to other
clients while waiting for the (expected to be non-blocking) connect() to
return. This is much much worse.
Stefan
next prev parent reply other threads:[~2007-12-05 18:41 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-04 18:53 sockets affected by IPsec always block (2.6.23) Simon Arlott
2007-12-05 0:12 ` Herbert Xu
2007-12-05 6:30 ` David Miller
2007-12-05 6:51 ` Herbert Xu
2007-12-05 7:12 ` David Miller
2007-12-05 7:16 ` Herbert Xu
2007-12-05 7:34 ` David Miller
2007-12-05 7:39 ` Herbert Xu
2007-12-05 9:55 ` David Miller
2007-12-05 9:57 ` Herbert Xu
2007-12-05 18:42 ` Stefan Rompf [this message]
2007-12-05 18:39 ` Stefan Rompf
2007-12-06 2:25 ` David Miller
2007-12-06 8:49 ` Stefan Rompf
2007-12-06 8:53 ` David Miller
2007-12-06 10:56 ` Stefan Rompf
2007-12-06 11:13 ` David Miller
2007-12-06 11:35 ` Stefan Rompf
2007-12-06 11:39 ` David Miller
2007-12-06 12:30 ` Stefan Rompf
2007-12-06 13:55 ` David Miller
2007-12-06 14:31 ` Stefan Rompf
2007-12-07 3:20 ` David Miller
2007-12-07 9:29 ` Stefan Rompf
2007-12-16 22:47 ` Bill Davidsen
2007-12-16 23:22 ` David Miller
2007-12-05 6:06 ` David Miller
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