My older befsr41 also didn't like the new 1.46.2 firmware. Web browsing would stall on both my macs on all browsers, but would work fine on my PC. It appears to be some DNS issue that manifests only with http GETs.
However, in my case, no amount of resetting, reflashing, and unplugging would fix the issue. I ended up reverting to 1.44.2 (http://www.hansenonline.net/Networking/linksysFW.html#Firmware) and all is well.
This being my second linksys firmware update/4 hour time-sink, I will definitely not be buying their products in the future for use with Macs.
Linksys befsr41/befsr11/befsru31
router firmware
Version: 1.46.2
1.46.2 doesn't like Macs
Feedback Type: Troubleshooting Report
Contributed by: kg23 Sunday, December 05 2004 @ 12:34 PM PST
Product Platform: MacOSX
Used Product For: Over One Year
Recommend Product: NO
System Info:PowerBook G4 / OSX 10.3.6
iMac DV G3400 / OS X 10.3.6
Dell / Windows XP Pro
Stinksys BEFSR41
1.46.2 doesn't like Macs -
unreal....I have an older BEFSR11, exactly these symptoms after upgrading to 1.46.2. Reverted as you did, problems are gone...
Note I had one other symptom that did affect PCs: inability to connect to my ISP's SMTP server. After reverting, that works again too.
I think it is an MTU issue or something to do with DNS - possibly an interaction between them.
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Monday, January 09 2006 @ 11:22 AM PST