Re: Strange network hangs/delays with Firefox/Thunderbird/ssh

[Michael Neumann <mneumann@xxxxxxxx>]

Matthew Dillon wrote:
> :Hi,
> :
> :Yesterday everthing works like a charm. Then, today in a different  
> :network, Thunderbird, Firefox3 and ssh seems to
> :need around a minute to connect (resolve DNS or load a page, don't  
> :know exactly), while w3m (text browser) doesn't show
> :any of the problems (it immediatly shows the page). ping does work of  
> :course too. Could that be related to threading issues?
> :
> :The only difference to yesterday (where everything worked perfectly)  
> :is that today I use bge0 instead of rum0.
> :I'll try it later in an again different network where I can both test  
> :bge0 and rum0.
> :
> :Regards,
> :
> :   Michael
>
>     Try turning off any automatic checksumming features on the interface.
>
>     What you are describing typically occurs when a network interface
>     starts dropping or mis-checksumming certain packets.
>
>     Other possibilities include: long or fragmented packets being
>     improperly blocked or erroring out.

Hm, it's very strange. "w3m" (a text browser) actually works like hell, 
while "fetch" doesn't work. When I open the same page (your Hammer patch 
diff for example) in w3m, it appears immediatly, while when I try to 
fetch it with "fetch", it gets stuck in

  #fetch -v http://apollo.backplane.com/DFlyMisc/hammer02.patch
  looking up apollo.backplane.com

and nothing further happens. So it seems to be a DNS problem.
But I thought they all are using the same resolver library.

Works:

  ping
  w3m
  dig

Hangs:

  fetch
  firefox
  thunderbird
  ssh

This only happens in this local net here, regarless whether I use the 
wireless card or the built in ethernet. Other operating systems work 
fine (I tried FreeBSD and MacOSX).

Any further hints what this could be?

Regards,

  Michael