You can try that Raj. Configure the switch port to 100 Mbps and the same
settings on the server too.
No . Until and unless specified the packet size will be 1500 bytes. The basis of
100 Mbps technology is the same as the 10 Mbps. Major difference being the
bandwidth only. Have you configured different MTU sizes on the switch or on the
servers? If they are the defaults then that should not be the problem.
It's ok with my wife till the time you start talking to her about my g/fs
Rita-Sita and Mita, etc...etc. So, when in floats? I am around till May 1st.
Regards,
- Gaurav
Raju Mathur <[EMAIL PROTECTED]> on 04/19/2000 01:49:04 PM
Please respond to [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc: [EMAIL PROTECTED] (bcc: Gaurav Sabharwal/HSS)
Subject: [LIH] RE: [linux-delhi] Network freezes
>>>>> "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
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