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New Member

FTP over IPsec

Dear All,

I am facing a slow response issue when using FTP over IPSec tunnel between Branch office Router and CO router

If I do FTP without IPsec then it works fine.

Please suggest.

Thanks,

Shailendra

3 REPLIES
Super Bronze

Re: FTP over IPsec

Possibly due to reduction of MTU when FTP is encapsulated within IPSec. If able, and if not already doing so, might try "ip tcp adjust-mss" with appropriate value to avoid fragmentation.

New Member

FTP over IPsec

Could you please explain how to do this, I am having the same problem between two Cisco RV220W's. FTP over my VPN is so slow, that I have to slow down the FTP Transfer to about 10kbps in order to keep the tansfer steady. Trying to move TB's of information at that speed is not reasonable.

Hall of Fame Super Silver

FTP over IPsec

There are a couple of good articles on the details of why this is often advisable on VPN-based links.

Cisco article

Packetlife article

Both are pretty old but the underlying technology is even older.

The basic setting is an interface configuration mode setting as follows:

int  
ip tcp adjust-mss 1460
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