My provider rejects GRE packets....

hello all,

i have 2 offices which i want to connect via VPN.. They are on the same ISP..
I tried IPIP but the provider seems to reject GRE packets…

is there any other way to establish some kind of VPN, using MT routers ?

i tried using linux boxes with openvpn and everything is ok.. but i want to use these MT routers..

Use L2TP

is there any way to connect an MT box with a linux box using IPIP ?

which packet should i have in the linux box ?

Some quick links regarding IPIP under linux. Please beware that I haven’t tried to connect a RouterOS system to a linux box via IPIP…
http://www.wlug.org.nz/HowToIPIP
http://www.patoche.org/LTT/security/00000175.html
That should get you going for experimenting with it. And please post your findings here in the forum, will you?

i did this in a debian box and it worked…

modprobe ipip
ip tunnel add tunl1 mode ipip remote remote.real.ip.here
ifconfig tunl1 192.168.0.1 netmask 255.255.255.0
route add -net 10.xx.xx.xx/xx dev tunl1

but when i try to use it with my ISP it does not work…
something is going wrong with ip-encap packets…