Cannot ping default gateway of ISP

5 pts.
Tags:
Default gateway
ISP
Network connectivity
Ping
Can Anyone help me that why i can not ping default gateway address 96.52.160.1 I am kind of frustrate that it looks everything OK to me but since last one week day and night i am trying to figure out that why it can not ping ISP and neither can open webpage (DNS are entered correctly) 1600_Router#sh run Building configuration… Current configuration : 787 bytes ! version 12.1 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname 1600_Router ! logging buffered 4096 debugging ! ip subnet-zero no ip finger ! interface Ethernet0 ip address 96.52.160.200 255.255.252.0 ip nat outside ! interface Serial0 ip address 192.168.1.1 255.255.255.0 ip nat inside clockrate 500000 ! router rip network 96.0.0.0 network 192.168.1.0 ! ip nat inside source list 10 interface Ethernet0 overload ip classless ip route 0.0.0.0 0.0.0.0 96.52.160.1 no ip http server ! access-list 10 permit 192.168.0.0 0.0.255.255 ! end

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Have you confirmed with your provider that the next hop from your router is indeed the 96.52.160.1 address? It is also possible that the carrier is blocking ICMP (ping) traffic. You should talk to their support line to see if they are blocking ICMP. It also seems odd to me that you are putting RIP on the entire 96.0.0.0 network.

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  • BlankReg
    The first thing that strikes me as odd with this config, is that the Internet connection is Ethernet and the local network is on a serial connection. What equipment have the service provider put on site ? Also the IP address and mask you have put on the Internet facing interface, 255.255.252.0, allows for 1024 addresses. Even big corporate business does not have this many addresses these days. You need to check the information provided to you from the service provider, and check that what is in the config is correct. Also, as Labnuke99 said, do not rely on PING, it is NOT a guarantee that something is not working if there are no replies. Try http to the ip address of a known website, that is a much better test, or PING something you know does respond. Most service providers give you a DNS address, try a name lookup to that, rather than rely on PING,
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  • BlankReg
    Oh yes, and turn off the RIP routing protocol, unless you need it for the internal network. Then just remove the network 96.0.0.0 line in the config. You definately don't need it on the Internet connection, and if you need to propgate the fact that this is the Internet gateway, to the internal network, use the 'default-originate' command in the RIP config which sends the 0.0.0.0 0.0.0.0 route in the updates.
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