Problems with FreeBSD

[Brian Whalen]

Giorgos Keramidas wrote:
> On Tue, 4 Nov 2008 11:10:25 -0200, "J MPZ" <joompz at 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