I have two dns servers, DNS1 goes out through ADSL router R1 (this is the firewall’s default route). DNS2 goes out through R2 ADSL Router (R1 send all the traffic from DNS2 to R2). R2 has only one public IP address so I’m doing NAT overload for browsing and PAT for udp 53 (dns). The firewall and R1 are using public IP addresses of R1, so no need to nat in R1.
If I’m outside of my bussiness and query my dns servers (nslookup), I have no problem with DNS1, but queries to DNS2 donot work
Important R2 configuration
ip address xxxx
no ip redirects
ip nat inside
ip tcp adjust-mss 1452
ip address negotiated
ip nat outside
dialer pool 1
no cdp enable
ppp authentication chap pap callin
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer1
ip nat inside source list 1 interface Dialer1 overload
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