% sudo ifconfig en1 inet mtu 1400
The mtu gets reset to 1500 on reboot. Under Linux, you'd edit some network .conf files to fix it permanently; under OS X, I suspect you have to use NetInfo Manager to do it.
--Ron
At 15:37 -0800 11/6/02, Matt Jones opined:
To refresh your memory, I wrote in last week with a problem forwarding e-mails with large attachments from our SIMS server to pacbell's mail server with an error that looked like this:17:29:20 3 SMTP-046(mail.pacbell.net) Unexpected T_GODATA, OTLook=256 17:29:20 3 SMTP-046(mail.pacbell.net) Sending Failed, Error Code=-25010 Through the help of Christopher Bart I was able to determine that as some e-mails were being sent, SIMS was getting disconnected from pacbell. Well, I sent an e-mail to pacbell with a detailed excerpt from a log file. Their response was that I needed to call them, which I looked forward about as much as getting a needle in my eye. So I avoided it for a while (I've got other work to do too). I assumed that it was pacbell's problem because I had not done anything to my network recently except added a two new computers and that wouldn't cause my problem. The problem was that the errors started happening a week before I discovered them and my short term memory sucks. Today, for some reason, I remembered that I had updated our routers firmware (MacSense X-Router MH-130) but thought that I had done it more towards the beginning of October. I looked to see how long our DSL connection had been active and it turns out we last reconnected the night before the e-mail problems started. While nobody can prove a thing, there is a great likelihood that that was when I updated the firmware. I reset our router and dsl modem... No Help. I then went to the MacSense web site and after coming very close to giving up I found a knowledgebase article about NAT, PPoE and MTU. Essentially, NAT and PPoE will add data to your packets. So if your computer sends out a packet near the maximum limit, NAT and PPoE can expand it to beyond the maximum allowable. MTU (maximum transferable unit) is the setting on your computer that controls how large packets sent from the computer can be. The bad thing was that the knowledge base article said the only way to change MTU in OS9 was to buy IPNet Tuner. However, I remembered reading something about this when installing our Asante Ethernet cards. And sure enough you can set the MTU of the computer in the Asante control panel. Changing the MTU has allowed me to reliably send e-mails with large attachments. Apparently the new router firmware added just a little more data to my packets and pushed them over the size limit causing the problem. I hope this epic helps someone else sometime. I apologize for the long winded story but I'm feeling very proud of myself for solving the problem. (although I should be feeling very stupid for forgetting about the firmware update.) Thanks again to Christopher Bart for helping me figure out what the fundamental problem was. -Matt -- Matthew B. Jones Manager, Environmental Services Mestre Greve Associates 27812 El Lazo Laguna Niguel, CA 92677-3915 949-349-0671 ext. 104 949-349-0679 FAX [EMAIL PROTECTED]
-- Ron Risley www.risley.net ############################################################# This message is sent to you because you are subscribed to the mailing list <[EMAIL PROTECTED]>. To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> Send administrative queries to <[EMAIL PROTECTED]>
