Re: The system works (2.6.14-rc2): functional k8n-dl

Bill Davidsen
2005-09-24T17:29:28Z

Nishanth Aravamudan wrote:

>On 23.09.2005 [13:43:26 -0400], Bill Davidsen wrote:
>
>
>>Nishanth Aravamudan wrote:
>>
>>
>>
>>>On 22.09.2005 [15:19:05 -0400], Bill Davidsen wrote:
>>>
>>>
>>>
>>>
>>>>Nishanth Aravamudan wrote:
>>>>
>>>>
>>>>
>>>>
>>>>>Hello all,
>>>>>
>>>>>
>>>>>
>>>>>
>>><snip my long mail>
>>>
>>>
>>>
>>>
>>>
>>>>>code in such a solid state. I have had only one complaint so far: it
>>>>>seems that the the "Broadcom Corporation NetXtreme BCM5751 Gigabit
>>>>>Ethernet PCI Express" adapter, with the tg3 driver, downs and ups the
>>>>>iface on MTU changes. Unfortunately, with some VPN software I use, it is
>>>>>sometimes necessary to drop the MTU to 1300 or so to get consistent
>>>>>connections. When I do this, though, ssh through the tunnel tends to not
>>>>>function. I have a workaround, where I bounce over a different laptop,
>>>>>but that's a bit of a pain (and that network adapter seems to be able to
>>>>>transiently change the MTU). Not a big deal, in any case.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>You can (or could in 2.4) sometimes play with the size for an individual
>>>>IP by using the "mss" option of the old "route" command. That shouldn't
>>>>glitch anything, it just should use little packets.
>>>>
>>>>
>>>>
>>>>
>>>Yes, I see that still being an option. Let me go learn how to use route
>>>and see if that works better.
>>>
>>>
>>>
>>>
>>route <destination_IP> gw <default_router_IP> mss 1200
>>
>>
>
>Thanks, that works for setting the mss, but when setting it to 1200, i
>can't even ping the remote host. I can ping it if remove the mss change.
>I can even ssh to it. It just so happens that when I try to ls a large
>directory, the connection tends to hang. Any other ideas? Or tracing I
>can do to figure it out?
>

tcpdump is your friend, and I just gave 1200 as an example, set it as
large as you can without hitting the original problem. Then check what's
actually happening with tcpdump if it doesn't work.

--
bill davidsen <davidsen@tmr.com>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979