We have a desing which involves the IPSec VPN between the SRX1500 firewall and Juniper Netscreen ISG2000. There are multiple LANs behind the SRX1500 and a single LAN behind the ISG2000. Traffic selectors have been configured on SRX with single Tunnel interface while Multiple Proxy-IDs on the ISG2000 also with single tunnel interface.
Now Sometimes one of the LAN's is inaccessible while other LAN's are accessible at the same time. How should i diagnose this? Please help me out.