I have a cisco 1841 router I brought home for the weekend to play with from work. I set it up at work just fine with a static ip from my isp. However at home I don't have a static ip. I got it all configured and set interface fastethernet 0/0 as my wan and set the ip address to dhcp. I have nat turned on as well. I set up fastethernet 0/1 as my lan. I also setup a ACL to permit any and overload on fastethernet 0/0. from the router I can ping www.google.com and 126.96.36.199 and get responses. On my computer however I cannot get responses. I can however ping the router. What am I missing?
Current configuration : 911 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! no logging console ! no aaa new-model dot11 syslog ip cef ! ! ! ! multilink bundle-name authenticated ! ! ! ! archive log config hidekeys ! ! ! ! ! interface FastEthernet0/0 ip address dhcp ip nat outside ip virtual-reassembly duplex auto speed auto ! interface FastEthernet0/1 ip address 10.10.1.253 255.255.255.0 ip nat inside ip virtual-reassembly duplex auto speed auto ! interface Serial0/0/0 no ip address shutdown ! ip forward-protocol nd ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 ! ! no ip http server no ip http secure-server ip nat source list 1 interface FastEthernet0/0 overload ! access-list 1 permit any ! ! control-plane ! ! line con 0 line aux 0 line vty 0 4 login ! scheduler allocate 20000 1000 end
I tried to configure this over a lab and I was able to get positive results with ACL 1 set to any but you may still want to try johnlloyd_13's suggestion.
However, what I tried to do in my lab is to set the customer facing interface of the ISP to no ip proxy-arp since your default route is just pointing out to exit interface. When I turned on proxy-arp on the ISP router then I was able to ping anything on the ISP side. Apparently, you have mentioned that ICMP from the router works fine so we could eliminate proxy-arp issue at the ISP side.
What I can suggest is to turn on NAT and ARP debug to see if you are translating your internal network properly.
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