Hi,
- is it available all tunnels into one LNS group? (Router allow maximum 16 groups)
== Yes.
- is there source-loopback number limit into one LNS group?
== No, you can configure multi source interfaces under the LNS group view.
- Can I make load balance into one LNS group? We want to have a balanced distribution of users in 4 tunnels going to a LAC.
== No, it's not supported to do this.