Found out what caused it. The VPN Router was pinging a tunnelled IP 
address..which didn't exist.

I guess this is their peer detection and it was dropping the tunnel 
every 5-9 seconds.

-Ross

Chris Buechler wrote:

> On 5/20/06, Ross Richards <ross dot richards at gmail dot com> wrote:
>
>> Hi guys,
>>
>> I'm trying to trouble shoot a tunnelling issue between m0n0wall and
>> another vpn router. I'm getting packetloss between sites via the ipsec
>> tunnel.
>>
>
> Do you see the same loss outside the tunnel?  i.e. if you ping the
> public IP of the remote side from each site, is there any loss?
>
> I can't recall of anyone here reporting periodic loss over IPsec like
> this unless it's related to general Internet packet loss between the
> two locations.
>
> -Chris
>
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