VPN increases the latency - workaround - tunnel vpn - different ISP adds milliseconds

Experts,

I came across a very interesting question.  I connect 3 offices via point to point wireless antena.  There is a main central situation and 2 remote offices.

Before all the location were running under the same provider of point to point wireless antenna.  Each antenna works at 10 Mbps.

Central location Antenna1 - remote peer 1 (vpn and latency works perfectly)

Location central antenna 2 - 2 remote peer (latency increases vpn but ip to ip works fine).

For the central location 2, these are the tests that I ran

Central location Antena 2

Router on the inside: 10.10.10.1

Router to the outside: 200.1.1.1

Remote peer 2:

Router on the inside: 10.9.9.1

Router to the outside: 195.2.2.2

Success rate is 100 per cent (5/5), round-trip min/avg/max = 432/553/656 ms (when I ping via the VPN to 10.10.10.1 to 10.9.9.1)

Success rate is 100 percent (5/5), round-trip min/avg/max = ms 18/12/28 (that's when I regular internet ping from 200.1.1.1 to 195.2.2.2.2)

What could cause this huge delay?  I tested several routers on Antenna2 and this is the same result.  Delay only happens when I have add VPN.

Thank you for any light...

Randall

Hi Randal

Certainly, there is a work around. It is by lowering the ip mtu before his hitting the tunnel. "The way to counter this is to set the mtu on the tunnel interface ip to 1400bytes (if you with GRE Tunnel IPsec) you can lower it more as well.if you want well.you can combine it with the ip tcp adjust-mss. Essentially, we let the size of the package get any more big as 1500bytes altogether so that the jumps between the two have to do fragmenatation. The delay is caused by the fragmentation between the two

The link below should guide you in the right direction.

http://www.Cisco.com/en/us/Tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml

HTH

Kishore

Tags: Cisco Security

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