01-03-2011 01:00 PM - edited 03-06-2019 02:47 PM
Hi,
I have an FTP file transfer issue.
Client is accessing an application in Data center to put some files via FTP.
When he access from office it works fine. As he access from home (Office LAN is extended to home through wireless network, meaning he gets same IP etc while at office or at home so same policies are applied on his laptop)(setup is Date center <<----->> Branchoffice <----> wireless bridge <---> wireless bridge <--> Home) it doesn't works.
Find attached the capture for both situations. I have included only some packets and removed other extra.
Please share your views.
Thank You.
01-03-2011 01:50 PM
It appears to be an MTU issue, looking at the wireshark captures , you can see the FTP server is sending packets with Donot frag Bit set on. That is the reason that when the client is connected to the office network the MTU is good enough for transfer where as the wireless bridge connection as a lower MTU and is dropping the packets.
Try ping -f -l 1500-1300 ftp-server from client machine and see the optimum MTU for the path. Then set the MSS on the clients laptop to the successful MTU and give it a try.
if that doesn't work then we can look more into it and get tcpdump from the server side.
Manish
01-03-2011 02:35 PM
If indeed is an MTU issue you may use one of the following tools to help you out
Configuration would look like
route-map TEST
match ...
set ip df bit 0
Interface
ip policy route-map TEST
Hope this helps you out
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