Strange network hangs/delays with Firefox/Thunderbird/ssh

[Michael Neumann]

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