1. By no means I'm MTU guru. 2. I cannot give you technical explanation why it's happening. 3. It does happen to me.
Here's the story: I'm managing two ADSL connections. One at home, one at work. Both are connected to Actcom, one regular account, one "business". Essentially the same setup (RedHat 7.2 with some tuneups). From home everything works ok, from work my boss cannot browse to http://www.tase.co.il.; Session hangs forever... After I reduced MTU to 1400, everything works perfectly again! Don't know the reason, but you definitely should try reducing MTU to smaller value and see if the problems go away. Greetings, Haim. > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] On Behalf Of Aviram Jenik > Sent: Monday, March 04, 2002 8:23 PM > To: [EMAIL PROTECTED] > Subject: mtu problems? > > > A question to the MTU gurus (Muli/Dani?): > > I'm pretty sure I have an MTU problem. However, I can't figure out: > A. How to 'debug' it (i.e. I don't know if the problem is really MTU) > B. What the problem is (if it exists). > > I think that (A) is especially important, since I'm getting > the feeling I'm > chasing ghosts; > > The symptoms are as follows: > I'm have an excellent ADSL connection, but connecting to > certain servers > using timeout-sensitive protocols I am having problems. For > example, when > trying to upload files to my FTP server, either using FTP or > SSH + rz, the > connection takes forever and breaks up in the middle quite frequently. > Pinging the server shows that my packet loss is negligible > and that the > connection is fast (~35ms, <1% packet loss). Other people can > FTP with no > problems. I have no other problems with that server or with > my Internet > connection in general (i.e SMTP, HTTP all work quite nicely). > The only think > I can think of is some strange MTU problem. > > For example, trying to FTP from my linux connection (the one > connected to an > ADSL) via FTP fails miserably with timeouts. The connection is done > directly, so it's not a masquerading problem. > > Now the facts: > The MTU on the ppp0 interface is: 1452 > The MTU on the eth1 interface (the one connected to the ADSL > modem) is: 1500 > > as far as I can tell from the how-to, that should be the > right values. Any > idea how I can debug it and/or fix the problem? > > Thanks, > Aviram Jenik > Beyond Security Ltd. > http://www.BeyondSecurity.com > http://www.SecuriTeam.com > > Know that you're safe: > http://www.AutomatedScanning.com > > > > ================================================================= > To unsubscribe, send mail to [EMAIL PROTECTED] with > the word "unsubscribe" in the message body, e.g., run the command > echo unsubscribe | mail [EMAIL PROTECTED] > > > ================================================================To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
