>>>>> "Gaurav" == CAP <Sabharwal> writes:
Gaurav> Hey Raj, hmmm...Interesting. What does tcpdump or some
Gaurav> other sniffer has to say about this mischief? I have seen
Gaurav> these problems with the firewalls/masq devices that have
Gaurav> not been configured properly and tend to slow down the
Gaurav> connections. You must also be seeing that if you telnet to
Gaurav> the server you get a prompt after ages. Is it the case? I
Gaurav> know I am asking a wrong guy this stupid question, but is
Gaurav> DNS, etc configured properly? I hope you are not trying to
Gaurav> do any of the LDAP, etc gizmos.
No funky configurations. The firewall works beautifully for Winduhs
boxen, I'm considering scrapping Linux and moving to Lose2000 now.
[Aargh! NOT! Tempting though it may be]
Gaurav> What on the switch side? Have you checked the ports on the
Gaurav> switch for any excessive collisions, giants, runts, etc?
Gaurav> Are the ports configured properly? If it's a 10/100 Mbps
Gaurav> switch be sure that it is not configured for
Gaurav> auto-negotiation for the bandwidth and the parameters are
Gaurav> same as on the linux machines and vice-versa. The whole
Gaurav> funda of auto-negotiation sucks in switches because every
Gaurav> vendor having it's own standards. Connection goes for a
Gaurav> toss or is disrupted every now and then because of the
Gaurav> stupid auto-negotiation. I have seen this happening
Gaurav> between Sun, Compaq and Cisco boxes.
Jeez, what's a giant/runt? Hmm, s'pose I just force that port on the
switch to 100MB/s (or 10MB/s), might that make a difference? I
seriously suspect the switch, since I've had this problem between IRIX
machines connected to a similar (Nortel) switch in the past too.
Gaurav> AFAIK, tcpdump is your best friend and should be able to
Gaurav> help you with more clues on the problem or maybe by
Gaurav> confusing you more :-) Or else put up a sniffer on a
Gaurav> switch port...span the port to which the server is
Gaurav> connected to the port sniffer is connected. With the help
Gaurav> of span you will be able to see the same packets that are
Gaurav> being sent to the server on the port on which the sniffer
Gaurav> is connected and hence making packets available to you.
Are packets on 100MB/s ethernet larger than 1500 bytes (the 10MB/s eth
packet limit)? Could that be a problem with some machine or the
switch trying fragmentation/defragmentation on the way?
Gaurav> Better still...hire me for a "small" fees ;-)
Done! Beer at Float's (if your wife will let you spend the evening
out with the guys). (Haahaa, gotcha!)
Regards,
-- Raju
Gaurav> - Gaurav
>> -----Original Message----- From: Raju Mathur
>> [mailto:[EMAIL PROTECTED]] Sent: Tuesday, April 18, 2000
>> 8:11 AM To: [EMAIL PROTECTED];
>> [EMAIL PROTECTED] Subject: [linux-delhi]
>> Network freezes
>>
>> Hi,
>>
>> I'm facing a weird problem with my network. I have three
>> systems (A, B and C) connected to each other using a Nortel
>> switch. A is a linux box is on a private IP, B is a Linux Masq
>> system (both private and public IP's) and C is another Unix box
>> outside the Masq, on a public IP.
>>
>> I can transfer large files between B and C without problems.
>> However, whenever I try to copy a large file from any Unix
>> machine to A (using FTP, rcp, ssh, whatever), the connection
>> freezes for long periods of time. If I use a Winduhs machine
>> instead of A, file transfers go through without any problems.
>> Anyone seen this freezing problem with a switch earlier? I
>> haven't checked with a hub, but for a number of reasons I feel
>> that the problem will disappear with a hub.
>>
>> Regards,
>>
>> -- Raju
-----------------------------------------------------------------------
For more information on the LIH mailing list see:
http://lists.linux-india.org/lists/LIH
