AT&T 3800HGV RG, Static IP and multiple Cisco Routers
I've got a block of 8 static IPs, one A.B.C.64 /29 - A.B.C.70 is my default gateway, my Cisco E2000 router runs my main home LAN and is doing just fine. I am using two of the RG's ports to run my U-verse set-top boxes via Ethernet, one for the WAN link on the E2000 and one goes to a 4-port DLink switch that then goes to a Cisco 2621XM. Everythings works super except the 2621... I have fa0/1 setup to A.B.C.66 (the E2000 is .65, btw) and I have fa0/0 set to 172.16.1.1 /24 and one PC connected to it set to 172.16.1.10 /24 with a default gateway of 172.16.1.1. I can ping A.B.C.70 from the 2621 just fine and I can ping an outside address such as Google, Apple, etc just fine. What is puzzling me to no end is why I CAN ping A.B.C.66 from the PC, but I CANNOT ping A.B.C.70???? What the heck, it's a directly connected interface; I cannot for the life of me understand this. The only thing I can come up with is that somehow the RG is not setting up a return route.
I tried this before with and without NAT, same result, this current config has NAT turned on. I am a novice so it is quite likely I have something setup wrong. For instance, it seems redundant to have both a default gateway to xxx.xxx.xxx.70 and also a quad-zero route, but I tried it just to see if it fixed it and haven't turned the default gateway back off. Another odd thing is that if I set up a quad-zero pointing directly to the fa0/1 it won't ping to the WAN, Google, Apple, etc, I must use the 0.0.0.0 0.0.0.0 xxx.xxx.xxx.70, why is that?
Here's my current config:
Current configuration : 823 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! ! memory-size iomem 10 no aaa new-model ip subnet-zero ip cef ! ! ! ! ! ! ! ! interface FastEthernet0/0 ip address 172.16.1.1 255.255.255.0 duplex auto speed auto ! interface Serial0/0 no ip address shutdown ! interface FastEthernet0/1 ip address xxx.xxx.xxx.66 255.255.255.248 ip nat outside duplex auto speed auto ! interface Serial0/1 no ip address ! ip default-gateway xxx.xxx.xxx.70 ip nat inside source list 1 interface FastEthernet0/0 overload ip http server ip classless ip route 0.0.0.0 0.0.0.0 xxx.xxx.xxx.70 ! ! access-list 1 permit 172.16.1.0 0.0.0.255 ! line con 0 logging synchronous line aux 0 line vty 0 4 login ! ! end
EDIT: I got it fixed, I had the NAT setup wrong, needed to have:
ip nat inside source list 1 interface FastEthernet0/1 overload
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