Can't ping ISP router anymore

[John Cheetley]

Hi Team,

This is all for the purpose of SIP connectivity so am assuming that you do need to be able to have ping established connection for SIP to progress too

Unfortunately I have lost access to my ISP's router of 220.233.1.203

My set up is this

ISP router 192.168.20.1

Cisco 2691 MPS router 192.168.20.2 via FA0/0 to port 3 on router

This is a double NAT environment but have added 192.168.20.2 IP to the DMZ in the Firewall

Below is the current routing table

CiscoCurious#sh ip route
Codes: 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

Gateway of last resort is not set

C 192.168.30.0/24 is directly connected, FastEthernet0/0
C 192.168.11.0/24 is directly connected, FastEthernet0/1.1
C 192.168.20.0/24 is directly connected, FastEthernet0/1.10
CiscoCurious#

Some commands I have run are...

CiscoCurious(config)#ip route 203.1.233.220 255.255.255.0 192.168.20.2
%Inconsistent address and mask

CiscoCurious(config)#ip route 203.1.233.220 255.255.255.0 192.168.20.1
%Inconsistent address and mask
CiscoCurious(config)#

CiscoCurious(config)#ip route 203.1.233.220 255.255.255.0 FA0/0
%Inconsistent address and mask
CiscoCurious(config)#

CiscoCurious(config)#ip route 203.1.233.220 255.255.255.0 FA0/0 permanent
%Inconsistent address and mask
CiscoCurious(config)#

The last one resulted in this change

"Gateway of last resort is 0.0.0.0 to network 0.0.0.0"

C 192.168.30.0/24 is directly connected, FastEthernet0/0
C 192.168.11.0/24 is directly connected, FastEthernet0/1.1
C 192.168.20.0/24 is directly connected, FastEthernet0/1.10
And this "S* 0.0.0.0/0 is directly connected, FastEthernet0/0"
CiscoCurious#

I had thought that ip route destination ip, mask, 192.168.20.1 would have sufficed considering 192.168.20.2 (my cisco router) is already in the ISP router firewall on my side unless I need to use next hop?

Thanks again. If this doesn't make sense, let me know and will assist further

[Reza Sharifi]

Hi,

CiscoCurious(config)#ip route 203.1.233.220 255.255.255.0 192.168.20.2
%Inconsistent address and mask

Your statement is incorrect.  If you want to have a static router to 203.1.233.220 255.255.255.0

You have to use the subnet and not the host address.  So, the statement would look like this:

ip route 203.1.233.0 255.255.255.0 192.168.20.1

Also, I am not sure why you need to have this statement at all because if you are trying to reach the outside world using the SIP, you need a default route 

ip route 0.0.0.0 0.0.0.0 192.168.20.1 (ISP router)

HTH

[John Cheetley]

Hi Reza,

Thanks for your quick reply.

I tried that path already and system replied with (it's this router) and inconsistent address

Tried default route

ip route 0.0.0.0 0.0.0.0 220.233.1.203 and that gets me to ISP router. Thanks very much. Have to note that down.

Now. Tried pinging and traceroute to ISP but not work. Just gives me rows of stars.

[Deepak Kumar]

Hi,

You are making some mistake in the configuration of the routes as

CiscoCurious(config)#ip route 203.1.233.220 255.255.255.0 192.168.20.2
%Inconsistent address and mask

You used the host address but as per your subnet, it is required a "Network address / Subnet".

You can make it as:

CiscoCurious(config)#ip route 203.1.233.0 255.255.255.0 192.168.20.1

But as per you mentioned that you want to reach outside world. I have to use the default route:

CiscoCurious(config)#ip route 0.0.0.0 0.0.0.0 192.168.20.1

Try this on your router. I am sure that your problem will resolve. Typo edited.

Don't forget to vote a good solution. 

Regards,

Deepak Kumar

[John Cheetley]

Thanks Deepak for your reply.

Updated table. Unfortunately that didn't work. :) 

[Deepak Kumar]

Hi,
Sorry for typo it must be

CiscoCurious(config)#ip route 0.0.0.0 0.0.0.0 192.168.20.1
Regards,
Deepak Kumar

[John Cheetley]

Thanks Deepak, 

I tried that. Invalid next hop address( It's this router) message

[Deepak Kumar]

Hi,
How is it?
You mentioned that:
ISP router 192.168.20.1

Can you draw your network diagram with IP address details?
IP route 0.0.0.0 0.0.0.0 FastEthernet0/1.10
Regards,
Deepak Kumar

[John Cheetley]

Hi Deepak.

Setup is simple

ISP supplied router (192.168.20.1) having 4 ether ports and 1 eth WLAN that goes to ISP

2691 MPS Cisco router (192.168.20.2) connects to this via FA0/0

As this is double NAT I have placed cisco routers IP address in the ISP supplied router firewall in the DMZ

Using console cable to connect to router at this stage

HTH

[Deepak Kumar]

Hi,

Is it possible to share the running configuration of both routers?

Regards,

Deepak Kumar

[John Cheetley]

Sure can. Getting now.

[John Cheetley]

This is a router on a stick scenario. 1 router and 1 layer 2 switch. Am doing this from the router though. Do you still want the configs?

[Deepak Kumar]

Yes, Please

Regards,
Deepak Kumar

[John Cheetley]

Getting now. One moment

[John Cheetley]

Thanks Deepak. Find attached