IPSEC VPN TUNNEL BANDWIDTH LIMITATIONS

[dasgill]

Dear All,

We are currently have in place a Pix to Pix VPN tunnel accross a 512K internet connection between 2 Offices. The VPN tunnel is between a Cisco PIX 506E and a Cisco PIX 520. Due to the geographical distance between the sites there is a latency of about 400 seconds. Thers is a proposal to upgrade the 512 internet link to 2Mb.

Are there bandwidth limitations for a pix-pix VPN tunnel? Would the throughput increase as a result of increasing the internet link from 512K - 2Mb accross the VPN tunnel?

[johansens]

The only limitations lies in the platforms and their limitations..

The PIX 506E marketing-info states it delivers up to 16 Mbps 3DES IPsec... That's usually 8Mbps each way.. an you can probably subtract another 1-2 Mbps marketing factor so it'll handle about 6-7 Mbps of 3DES IPsec traffic..

So if you upgrade your internet-connection from 512k to 2Mbps, the VPN tunnel will also be able to use this bandwidth.. I would be more worried about the latency.. 400 seconds is after all almost 7 minutes... but if you really mean 400 msec, it's still quite a large number.... though I work daily remote from Brazil to Norway and the latency is about 200-400 msec.. all depending.. and I run VoIP over IPsec.. :)

Did it help?