Question

Routing to and fro a sub network

Asked by: pajiao

Hi,

Below is a synopsis of my network:

NETWORK_1
----------
Addr: 192.168.1.0/24, GW: 192.168.1.1(Firewall/Router)

NETWORK_2
----------
Addr: 192.168.2.0/24,
via router at 192.168.1.200 (Cisco)

Problem:
I have a host at NETWORK_2 with the IP 192.168.2.100. Hosts are reachable between NETWORK_1 and NETWORK_2 with the FW/Router(192.168.1.1) doing the routing.

Host at NETWORK_2 attempts to reach INTERNET via 192.168.1.1 (Firewall/Router), packet filter log shows ALLOWED. However response did not return.

An attempt to test from Internet to Host at NETWORK_2 was received by FW/Router(192.168.1.1) successfully and allowed according to packet filter logs. (NAT: Any->PUBLIC_IP/Any, (dst)192.168.2.100). However did not reach the destination.

My current static route is:
Source: Any
Service: Any
Destination: NETWORK_2 (192.168.2.0/24)
Target: Cisco Router (192.168.1.200)

The policy enables both NETWORK_1 and NETWORK_2 to reach each other. The FW/Router (192.168.1.1) can ping NETWORK_2 successfully.

What else needs to be done?

Thanks
Fred

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Asked On
2008-02-01 at 02:29:01ID23129090
Topics

Networking Hardware

,

Network Routers

Participating Experts
2
Points
500
Comments
15

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Answers

 

by: from_expPosted on 2008-02-01 at 04:20:26ID: 20795937

check nat rules on your firewall

 

by: TreyHPosted on 2008-02-01 at 04:32:16ID: 20795992

Your Cisco router needs a default route of the firewall, something like:
ip route 0.0.0.0 0.0.0.0 192.168.1.1
(If it receives a destination address of anything other than 192.168.1.0/24 or 192.168.2.0/24, it will route it to the firewall)

Your firewall needs a route to know how to get back to Network2, something like:
route 192.168.2.0 255.255.255.0 192.168.1.200 (the Cisco router)

All hosts should have a gateway address of the respective interface of the Cisco router.

 

by: pajiaoPosted on 2008-02-03 at 20:52:17ID: 20812005

Hi Trey,

All are present, that is why firewall and router and ping to and fro.

Hi exp,

NAT rules are correct.

 

by: from_expPosted on 2008-02-03 at 22:26:22ID: 20812366

hi!
please provide tracert -d <some host outside your network> from pc in the second subnet

please provide traceroute to your pc in second subnet from the 1.1 box

 

by: pajiaoPosted on 2008-02-05 at 20:55:30ID: 20829615

Tracert from outside to the subnet host stops at the public ip address.

Tracert from the pc in subnet to 192.168.1.1 firewall reaches successfully.

 

by: from_expPosted on 2008-02-06 at 00:14:45ID: 20830318

pajiao, i have asked for a bit different traces:

from pc with 192.168.2.x address to the real ip address within internet

from firewall(192.168.1.1) to your pc 192.168.2.x

 

by: pajiaoPosted on 2008-02-06 at 07:03:13ID: 20832444

from pc with 192.168.2.x address to the real ip address within internet
>> no problem.
from firewall(192.168.1.1) to your pc 192.168.2.x
>> no problem.

 

by: from_expPosted on 2008-02-06 at 07:14:02ID: 20832545

hm, this means that transmission is fine, so what do you mean by:
"Host at NETWORK_2 attempts to reach INTERNET via 192.168.1.1 (Firewall/Router), packet filter log shows ALLOWED. However response did not return. "?

 

by: pajiaoPosted on 2008-02-12 at 00:33:22ID: 20873194

Apologies. Some correction.

from pc with 192.168.2.x address to the real ip address within internet
>> tracert stops at the public ip address of the firewall (LAN:192.168.1.1).

from firewall(192.168.1.1) to your pc 192.168.2.x
>> no problem.

 

by: from_expPosted on 2008-02-12 at 00:36:37ID: 20873216

hi!
i suppose i would like to see your firewall's configuration.
it seems you have problem with acl permitting you out or more likely with nat rules

 

by: pajiaoPosted on 2008-02-13 at 01:21:59ID: 20882766

My firewall is not a cisco firewall.

Rules as below:
1) NAT: Any -> PUBLIC_IP_1 / Any   Src Translation: NETWORK_2_PC 192.168.2.100
2) Static Route: Any/Any  Destination: 192.168.2.0/24  Target: Cisco 192.168.1.200   (This enables NETWORK_1 to communicate with NETWORK_2)
3) Port 80 is opened. I tried having an IIS at NETWORK_2_PC which could access from NETWORK_1 but not from Internet.
4) No logs from Intrusion Detection system showing any activities that will be blocked.

Tracert from NETWORK_1
  1    <1 ms    <1 ms    <1 ms  192.168.1.1 (Firewall)
  2    <1 ms    <1 ms    <1 ms  PUBLIC_IP (public ip of the data center gateway)
  3      1 ms    1 ms    1 ms  TRACERT_DEST_IP

Tracert from NETWORK_2
  1    <1 ms    <1 ms    <1 ms  192.168.2.1 (Another Cisco router at NETWORK_2)
  2    <1 ms    <1 ms    <1 ms  MPLS_EXCHANGE IP
  3      1 ms      1 ms      1 ms  FIREWALL_PUBLIC_IP (This is the strange one as tracert from network1 shows the LAN_IP of the firewall instead)

Thanks

 

by: from_expPosted on 2008-02-13 at 07:01:42ID: 20884682

suppose your traces from network2 are taking different path. is it possible you have one more router there?

 

by: pajiaoPosted on 2008-03-19 at 04:02:51ID: 21160033

Hi pls close the question. Problem resolved

 

by: from_expPosted on 2008-03-20 at 01:54:30ID: 21169255

hmm, please describe the resolution and close case yourself. only owner(you) and moderator can close cases

 

by: pajiaoPosted on 2009-07-27 at 23:14:00ID: 24958227

Problem resolved

20120131-EE-VQP-002

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