Dan Austin wrote:
Stephen wrote:
If I connect two offices through an IPsec tunnel, what is the impact
on
latency, and does it noticeably affect calls?
That would depend a lot on the equipment that services the IPSEC tunnel
endpoints.
Has anyone out there tried this? What were the effects?
I've run small to mid size offices (20 to 60 people) over IPSEC
tunnels during periods of internal network failures with good results.
That includes offices on the opposite side of the world with one-way
latency normally around 100ms, but often up to 160ms.
Using commercial IPSEC endpoints, or OpenSWAN on a decent system only
adds a couple of ms, if that.
I might add that I did a little research for a non-voip project relative
to what cisco 28xx routers could sustain in terms of ipsec-vpn
throughput. The cisco doc's report 55 mbs sustained throughput.
On the flip side, the older cisco routers can't sustain 500 kbs without
adding a hardware encryption board to the router.
So, you are probably very right with the "depends a lot on the
equipment". ;)
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