ftp problems

[np1]

Hi,
I have Linksys WRT54GL v1.1 running Gargoyle 1.3.4
Its fed by a Draytel 120 trasparent ASDL modem

I have a consumer device which, when rebooted, attempts to send logfiles to an ftp server. The transfer fails.

I captured the network traffic between the device and the router.

The MTU of the ADSL modem is set to 1492, Linksys router MTU set to default 1500.

I can see the device sucessfully log in to remote ftp server (correct username/password), change to binary mode and start to transfer the file.

The device receives an OK to send data response and then attempts to send 1448 bytes of data. The ip header has the don't fragment flag set.

The Linksys router returns an ICMP messge Destination Unreachable (Fragmentation need) with an MTU of next hop specified as 1492.

But 1492 is bigger than the 1448 bytes the device is trying to send so it retransmits exactly the same 1448 bytes of data.

This transmit/icmp sequence repeats several times until the ftp server times out. The device eventually gives up and resets the connection. It therefore fails to send the data.

Does anyone have any idea why the gargoyle router responds with icmp fragmentation messages when the data length is less than the MTU next hop size specified in the icmp message?

I tried setting ADSL modem to 1500 MTU but the transfer still failed.

I also tried upgrading router to gargoyle 1.3.13 but I couldn't get the wifi to work so I went back to 1.3.4

Thanks for reading!
Nigel

[akeyalee]

How do documents become corrupt when uploading to FTP or other websites? My job requires me to upload a lot of documents for review on various FTP sites and websites. However sometimes these documents (large packages usually uploaded together) become corrupt, they are fine on my machine, what would cause this?
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