Date: Tue, 18 Jan 2011 15:40:17 +0200 From: Artyom Viklenko <artem@aws-net.org.ua> To: freebsd-net@freebsd.org Subject: Re: RESOLVED: Re: 8.1 Box does not react on ICMP "unreachable - need to frag" Message-ID: <4D359841.50306@aws-net.org.ua> In-Reply-To: <71EEB2EA-3F48-4850-AB9C-92E47ED72D99@Chaos1.DE> References: <F9645DE3-E8DD-4631-B248-06CB53F016EE@Chaos1.DE> <71EEB2EA-3F48-4850-AB9C-92E47ED72D99@Chaos1.DE>
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18.01.2011 14:23, Axel Rau пишет:
>
> Am 18.01.2011 um 11:00 schrieb Axel Rau:
>
>> The DB server returns its query results successfully until an
>> oversized message is being sent (with "DF" set), which the GW2 refuses
>> with an ICMP "unreachable - need to frag (mtu 1492)
> I could convince the firewall to defragment the packet itself. (-;
> This was a pf issue (I mixed up option "set reassemble" and filteropt
> "fragment").
>
> I'm still looking for an answer to question 1:
>> 1. Shouldn't DB2 fragment and resend the packet?
Generally - yes.
Make sure DB2 got ICMP need-frag message and it not blocked.
Also, check sysctl variable 'net.inet.tcp.path_mtu_discovery'.
Hope this helps. :)
--
Sincerely yours,
Artyom Viklenko.
-------------------------------------------------------
artem@aws-net.org.ua | http://www.aws-net.org.ua/~artem
artem@viklenko.net | JID: artem@jabber.aws-net.org.ua
FreeBSD: The Power to Serve - http://www.freebsd.org
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