Upgrade of LinkSys BEFSR11 firmware broke SMTP & Telnet

hmmmm.... now you have me wondering, I have never had problems setting up FTP port forwarding on my linksys for my friends to download hugh files or whatever. I have recently upgraded to the latest 1.46.11 or whatever the newest is, and any time someone tries to FTP in, they only get a connection time out or connection reset error.

There is definitely a problem with outbound SMTP connections to some ISPs after the 1.46 firmware upgrade. (I'm using Bell Canada's business DSL and had the same problem.) Outgoing SMTP connections over 1-2k time out. Rolling back the firmware to 1.45.11 fixes the problem, but re-introduces the DHCP renewal bug on PPPoE connections. If you roll back to 1.45.x and find your connection drops or your router crashes, try v1.44.2. You can get it at:

ftp://ftp.linksys.com/pub/befsr41/befsr-fw-1442.zip

If you have problems sending email greater than 1-2KB over DSL than you are most likely using PPPoE and have a MTU problem.

Make sure the Router MTU set to 1492. You can also try DSLReports, DRTcp.exe, and set the PC to MTU=1492 as well.

Dave

| > The router was working well, and all PC Internet programs were working fine. | > I upgraded the firmware to v1.46 because I liked some of the new features | > offered. | >

| > After upgrading the firmware, doing a full reset and re-entering all of my | > settings everything looked OK at first glance. Upon further testing I found | > that my outgoing email was not working, as well as a Telnet service I had | > running on port 4000. | >

| > Incoming email is OK, PCAnywhere is OK, Remote Desktop is OK. | >

| > I have rechecked the port forwarding settings for the Telnet service on port | > 4000, it is correct. | >

| > I have checked that MTU is set to what it was previously set to, 1492. | > I double checked my MTU settings by doing a ping -f -l xxxx | >

| > I have tried adding ports triggering for 110 and 4000, didn't help. | >

| > I called LinkSys, but talking to the tech was like talking to a brick wall. | > I could tell from the questions he asked that he just didn't understand the | > nature of the problem (or English!). | >

| > I am considering downgrading the firmware, but before I did I wanted to see | > if anyone here had any ideas on getting this version working correctly. | >

| > Thanks for you help.

The MTU was the first thing I checked. Mine was already set to 1492, and ramping it down did nothing to fix the problem. Having version

- Adam

and set the