All of a sudden I can't upload files via ftp over IPSec Tunnel between HQ & Branches, any bigger than 8192 bytes. When I try to upload them, it jams when it's uploaded 8192 bytes of the file. Also, if a file is smaller than 8192 byte the upload finish correctlyt. When I also upload in the LAN files bogger than 8192 byte, the upload finish correctly. The endpoints are Cisco 3845 and Cisco 2811. There are "ip mtu 1400" & "ip tcp adjust-mss 1360" commands configured in Tunnel interfaces in both ends.
How I can confirm that there is no any network issue, for this phenomenon? Any help would be appreciated.
Thanks in advance!