I've got a query to do with DNS and Site to Site VPN involving a Cisco 877 and 887.
Here is a quick and basic rundown of the two sites:
- Main office
Cisco 877 - 192.168.1.1
Small Business Server 2011 (DHCP, DNS) - 192.168.1.2
Cisco 887 (DHCP, DNS) - 192.168.21.1
The router at Office A has been in place for a couple of years now and running fine, the Small Business Server is doing all the usuals, DHCP & DNS etc...
The Cisco VPN Client & Windows VPN weren't ideal so we have decided to go for a permenant tunnel between both offices.
Today I configured the Cisco 887 at Office B, the VPN connection is up and running.
What I was hoping you guys could help me with is the DHCP & DNS for Office B.
Currently it is setup as following...
ip dhcp excluded-address 192.168.21.1 192.168.21.10
ip dhcp pool LAN_POOL
network 192.168.21.0 255.255.255.0
dns-server 192.168.1.2 192.168.21.1
ip domain name domain.local
ip name-server 123.456.798.1
ip name-server 123.456.789.2
no ipv6 cef
I want to make sure that a workstation at Office B looks directly out of the network for internet and only looks up the tunnel for devices and services in Office A. I understand the NAT governs this so should be fine? I'm slightly concerned that if the broadband was to go down at Office A that Office B will be without DNS...
I hope I'm being clear, and if you guys need any more of my config I'm happy to paste it in.
Many thanks in advance