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.
There is no any firewall between two endpoints. All the other traffic flow well, except FTP files over 8192 bytes. There in no path mtu discovery on routers, because of the relevant commands in Tunnel interfaces. I have already tested if there is any fragmentation issue with extended ping and the DF bit and everything seems works fine.
I am sending you the relevant tcpdump file from an FTP traffic flow. I am trying to GET a file bigger than 8192 bytes and the transfer is completed with file truncated in 8192 bytes. Could you please take a look and write any suggestion? The FTP Server IP Address is 172.16.23.130 (branch) and the IP Address 172.16.4.111 is the FTP Client Address (HQ).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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