So I was trying to test my internet connection with a cisco 1841 and a catalyst 3750 as a layer 2 switch
but without much success from the LAN side. It is a simple topology as below:
PC ----- 3750 switch ----- 1841 ------ internet
The 1841 serves as the gateway router and DHCP server for my LAN. It can ping and traceroute public IPs and my LAN devices. NAT has also been verified working, yet when inititated from LAN devices it cannot go beyond the intranet. I tried connecting the PC to 1841 f0/0 and it was still the same as when connected to the switch.
version 15.1 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname C1841 ! boot-start-marker boot system flash c1841-adventerprisek9-mz.151-4.M8.bin boot-end-marker ! ! enable secret 5 $9$XBm/$.QXWxyAtBCdBsi9quHEgp0 ! no aaa new-model ! dot11 syslog no ip source-route ! ! ! ! ip dhcp pool POOL network 192.168.0.0 255.255.255.0 dns-server 188.8.131.52 default-router 192.168.0.1 ! ip dhcp pool HOST01 host 192.168.0.3 255.255.255.0 client-identifier 0174.d02b.21a0.1d client-name don ! ip cef ip domain name local ip name-server 184.108.40.206 no ipv6 cef ! multilink bundle-name authenticated ! ! username don privilege 15 secret 5 $1&6gjq$TbB594thIMNSYOecbMogJC ! redundancy ! ! ip ssh version 2 ! interface FastEthernet0/0 description LAN ip address 192.168.0.1 255.255.255.0 ip nat inside ip virtual-reassembly in duplex auto speed auto ! interface FastEthernet0/1 description WAN ip address dhcp ip nat outside ip virtual-reassembly in duplex auto speed auto ! interface Serial0/0/0 no ip address shutdown ! ip forward-protocol nd no ip http server no ip http secure-server ! ! ip nat inside source list 1 interface FastEthernet0/1 overload ip route 0.0.0.0 0.0.0.0 dhcp ! access-list 1 permit 192.168.0.0 0.0.0.255 log ! control-plane !
C1841#sh ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP + - replicated route, % - next hop override
Gateway of last resort is 220.127.116.11 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 18.104.22.168, FastEthernet0/1 192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.0.0/24 is directly connected, FastEthernet0/0 L 192.168.0.1/32 is directly connected, FastEthernet0/0 22.214.171.124/24 is variably subnetted, 2 subnets, 2 masks C 126.96.36.199/24 is directly connected, FastEthernet0/1 L 188.8.131.52/32 is directly connected, FastEthernet0/1
C1841#ping 184.108.40.206 so 192.168.0.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 220.127.116.11, timeout is 2 seconds: Packet sent with a source address of 192.168.0.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/16 ms
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