08-30-2007 11:40 PM - edited 03-03-2019 06:32 PM
Hello,
Can anyone tell me if the following is possible?
I have an 1801 router connected via ADSL to my service provider. My ISP has provided me with 8 IP addresses (xx.xx.xxx.168/29). The LAN interface connects to a Watchguard Firebox firewall. The LAN interface is using the IP range xx.x.x.168/29 and I'm having to use NAT on the router to pass the external IPs to the internal IPs. What I'd like to know is if its possible to bind (if thats the correct phrase) the WAN and LAN interfaces together so the router and the Firebox are both on the external IP range and I don't have to use NAT on the router.
I hope this makes sense to someone, and any help would be greatly appreciated.
TIA
08-30-2007 11:45 PM
Hi Vincent,
No this is not possible, a router can't have 2 interfaces using the same IP address range, you'll get the "% x.x.x.x overlaps with
HTH,
Mohammed Mahmoud.
08-31-2007 12:43 AM
I have a similar setup using ADSL and here is my relevent configs.
interface ATM0
no ip address
atm ilmi-keepalive
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
dsl operating-mode auto
!
interface Dialer0
description ADSL to Griffin
ip unnumbered Ethernet0
no ip redirects
no ip unreachables
no ip proxy-arp
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname x@x.com
ppp chap password 0 xxxx
ppp ipcp dns request
!
interface Ethernet0
description LAN Ethernet server connection
ip address 85.x.x.145 255.255.255.248
hold-queue 100 out
!
This is an 800 series router so it has a 4port switch intergrated. With ethernet0 as the LAN interface.
With this setup I can plug any device into that 4port switch and assign it a public ip within the range of 85.x.x.144/29
08-31-2007 02:02 AM
Hi,
The use of ip unnumbered as illustrated by David can be used as a work around.
HTH,
Mohammed Mahmoud.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide