-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Aviram,
Well, I strongly believe that playing around with the MTU is not the right way to go about it. As you said, the ppp0 is set 1452 and eth0 is set to 1500. The packet filter should be able to fragment the packets correctly. I use a similar setup at home, only with a cable modem and an ISDN with another, and I don't get any problems. However, I have encountered in the past a similar problem. It was related to a transparent proxy issue with my ISP. According to your information, I would guess that your ISP is Internet Gold, as these problems are somewhat common over there. - From time to time, they add new subnets to the ADSL clients, and they simply forget to define all the proper settings in the transparent proxy. I would suggest that you approach your ISP and ask them to put a trace on your FTP session, so they can check where it gets cloged up. Best regards, Nir Simionovich Senior Network Manager m-Wise http://www.m-wise.com/ Phone: +972 (9) 958-1711 ext. 105 Fax: +972 (9) 958-1739 Mobile: +972 (54) 482826 - -----Original Message----- From: Aviram Jenik [mailto:[EMAIL PROTECTED]] 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] -----BEGIN PGP SIGNATURE----- Version: PGP 7.0.4 iQA/AwUBPIPAD4IPDOTXgnguEQL8+wCfcVEsDwXOoYLUwJEWZAaRgNTE6hYAn02w DEST+ISIZo5TlLaiC1/F8wj5 =T60Y -----END PGP SIGNATURE----- ================================================================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]
