Re: [squid-users] Problems with hotmail and facebook

From: Amos Jeffries <>
Date: Mon, 15 Nov 2010 00:42:19 +0000

On Sun, 14 Nov 2010 16:19:41 -0800 (PST), Landy Landy
<> wrote:
> Someone suggested to disable pmtu on squid and on the linux gw.
> I was able to disable it on linux:
> echo 1 > /proc/sys/net/ipv4/ip_no_pmtu_disc
> That hasn't change anything.
> Now, do I really need to disable it on squid in order to work? I read
> disable-pmtu-discovery=
> Control Path-MTU discovery usage:
> off lets OS decide on what to do (default).
> transparent disable PMTU discovery when transparent support is enabled.
> always disable always PMTU discovery.
> In many setups of transparently intercepting proxies Path-MTU
> discovery can not work on traffic towards the clients. This is
> the case when the intercepting device does not fully track
> connections and fails to forward ICMP must fragment messages
> to the cache server. If you have such setup and experience that
> certain clients sporadically hang or never complete requests set
> disable-pmtu-discovery option to 'transparent'.
> but, that option is "unrecognized" by squid. Is it really necessary to
> disable it on squid? If so, how?

Strange. That option is accepted in all 3.0 and later releases.
  http_port ... disable-pmtu-discovery=off

Being the default it should not need to be set. But wont hurt for

Received on Mon Nov 15 2010 - 00:42:23 MST

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