I have a linux box (A) providing mail/web service for my company. It
talks to an ISP I help run though their cisco terminal server via
ppp. That terminal server goes to another linux box (B) which is
connected via four modems running four ppp sessions which are eql'd to
ANOTHER linux box (C) which sits on a 10mbit connection to a major
backbone here in Canada. Please don't ask about the downlink, it's
convoluted through DirecPC since there are NO digital services in this
area.
anyway -- when C talks to A via B, (fetchmail, ftp, etc) I get MAJOR
stalling. If someone could send me a quick email on how to run
tcpdump to help get you guys relavent debugging info, I'd be more than
willing to help.
When A talks to B -- no problem. When B talks to C, no problem. When
A talks to C (i.e. if I'm uploading via FTP) the stalls don't seem
near as bad. but when I'm going the other way (C to A) it sure is
slow at times. It seems completely random as well, but if I am
sending major data it stalls MUCH quicker into the transfer.
Sometimes it recovers; most times it doesn't and I need to kill the
connection and retry.
All three linux boxen are running 2.1.124 as of last night. The
original setup was:
A - 2.1.105 (with 88 days uptime, that hurt to take down)
B - 2.1.112
C - 2.1.122
The reason I'm running alpha kernels (besides taking risks) is that
eventually I want to do some very slick packet routing based on TOS
and/or sockets. DirecPC is great for web/news/mail/realaudio but
blows big hairy donkeys for anything else.
If anyone could lend a hand here I would sure appreciate it. I'd be
willing to run tcp dumps, packet sniff logs, whatever is necessary. I
have root access on all three machines so I could really do some help
in the solvage of this problem I think... I just need someone with
intimate TCP/IP knowledge to lead my able hands. :-)
Andrew
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