[ccnpding]

1. DNS
behind FW we have a DNS sever for external domain name resolution which chats with ISP DNS server.
for servers with incoming access from internet, if the server has 2 internet IP addresses each from one ISP and two NAT rules are added , what else to do to make sure the server is reachable from internet when one ISP link fails? does that mean the server has one name with two IP addresses in DNS server?but how can the DNS server know one Link is down? or ...?

2. VPN
for site-to-site VPN, how to configure the fW's two IPs in remote FWs?
for securemote, establish 2 sites?

pls help.