If I hear you right, NB just needs a new gateway setup for each gateway, so if the ip of router one was 192.168.0.1, then gateway one would be 192.168.0.1. This would be done four times for each gateway, if you leave all other setting as they are you should be fine. However you will also need to setup failover if you need it. Don’t forget to setup NAT under Router for that ETH port.
thank you for your response
here is another part of problem i didnot know how to set. for accessing the internet system should use a Proxy with a proxyaddress and a proxyport. where should i set-it-up!?! 🙄
and another very very newbie Q: how to access ZS as an internet gateway 😕