1.Can someone tell me how many tunnels can i configure that would work at the same time in rb750.

2. in the ipsec configuration in the wiki there are all the steps to establish a tunnel between 2 networks. but what are the rules in the firewall that i have to configure in order to make the tunnel work.???

lets say that first network is: public 1.1.1.1 lan 2.2.2.2
and second network is: public: 3.3.3.3 lan:4.4.4.4

thanks.

I have been able to run up to 10 tunnels with out a problem on RB450G's and the RB1100

You will want your "/ip ipsec policy" to look like this for each tunnel

0 src-address=2.2.2.0/24 src-port=any dst-address=4.4.4.0/24
dst-port=any protocol=all action=encrypt level=require
ipsec-protocols=esp tunnel=yes sa-src-address=1.1.1.1
sa-dst-address=3.3.3.3 proposal=default priority=2

When you set up the other end you can just have it generate the policy

The side you want to make initial contact you will also need to have your "/ip firewall nat" to look something like this and make sure it has a high priority


0 chain=srcnat action=accept src-address=2.2.2.0/24
dst-address=4.4.4.0/24 out-interface="your WAN interface"

Then make sure you are not filtering this traffic in your /ip firewall filter

Here is a link with a nice instructional video on how to set up tunnels http://gregsowell.com/?p=787

Hope this helps