Date: Tue, 04 Nov 2008 14:28:56 -0800 From: Brian Whalen <brian@brianwhalen.net> To: freebsd-questions@freebsd.org Subject: Re: Problems with FreeBSD Message-ID: <4910CCA8.4020704@brianwhalen.net> In-Reply-To: <87mygfv9hi.fsf@kobe.laptop> References: <e56958de0811031643s473b499haa3243de1ed7c278@mail.gmail.com> <490FA51F.7010901@datapipe.com> <e56958de0811040510s494c898fra3ac683392ba2028@mail.gmail.com> <87mygfv9hi.fsf@kobe.laptop>
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Giorgos Keramidas wrote:
> On Tue, 4 Nov 2008 11:10:25 -0200, "J MPZ" <joompz@gmail.com> wrote:
>
>> Hi Paul,
>>
>> When my connections freeze, I open the tcpdump in other terminal. If I type
>> something, type "Enter", on the terminal frozen, the tcpdump show packets,
>> like that:
>>
>> 11:18:45.526256 IP (tos 0x0, ttl 51, id 651, offset 0, flags [DF], proto:
>> TCP (6), length: 112) 189.21.230.195.20787 > 201.57.5.2.2264: P 193:241(48)
>> ack 0 win 15136 <nop,nop,timestamp 1556398494 745829191,nop,nop,sack 1
>> {1428:1664}>
>>
> [...]
>
>
>> I'm using: tcpdump -nvvv -i ste0 host REMOTE_IP
>>
>
> Can you try capturing the connection setup packets, so we can look at
> the TCP MSS negotiation values? Starting TCPDUMP *before* one of the
> connections that stall is made should capture that.
>
> There may be an intermediate router or firewall that blocks ICMP and
> ends up breaking path MTU discovery. I've seen TCP connections
> 'stall' when path-mtu was broken by a setup like this and one of the
> intermediate routers started dropping TCP packets that were too large
> for one of its interfaces.
>
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Since the result set is so big, something else to try may be invoking
the ssh connection with compression on, -C is the flag. THis will allow
us to see if it really isnt working or is just slower than you'd like.
Brian
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