Question

Internet access denied on L2 switch

Asked by: chekfu

Hi Expert
Please help!

Unable to ping public IP or ASA inside IP on Catalyst 2950 switch as an access level

My network topology is very simple.
Internet == Cisco 877 == Cisco ASA 5505 == Cat3750 == Cat2950

In L3 switch Cat3750 using console, I can ASA 5505 inside IP. In L2 switch Cat2950 using console, I CANNOT ping it.

ASA running 192.168.10.2 with only default configuration and default access-list, no 1-to-1 NAT, no password is set. Already ICMP enabled in outside interface.
Cat3750 routed port is 192.168.10.1
Cat3750 trunk with Cat2950

Is anyone encounter? What is wrong?

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Asked On
2009-04-28 at 07:10:49ID24361735
Tags

Cisco

,

Switch

,

Catalyst

Topics

Network Switches & Hubs

,

Cisco PIX Firewall

,

Networking Hardware Firewalls

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: from_expPosted on 2009-04-28 at 07:21:26ID: 24251087

do you have a gateway set on 2950?
does asa has an ip route to 2950 (if 2950 is connected via a routed port, then asa should have a static route to 192.168.10.0/24 subnet)

 

by: chekfuPosted on 2009-04-28 at 07:36:51ID: 24251251

Cat3750 running IP 192.168.20.1 in vlan20 as a management vlan
Cat2950 running IP 192.168.20.2 in vlan20, default-gateway is 192.168.20.1.

I tried one WinXP machine conneccted to Cat2950's port 5 as vlan100. VLAN100 interface IP 192.168.100.1.
WinXP IP parameter I manually configured: IP-192.168.100.100, SM-255.255.255.0, GW-192.168.100.1, DNS-own ISP DNS. Using telnet in this machine, I can ping gateway which is 192.168.100.1. Ping management vlan IPs 192.168.20.1 or 192.168.20.2 OK. Ping routed port 192.168.10.1 OK. But ping 192.168.10.2 (ASA inside IP) failed.

What do you by Static route? What must I configure in my ASA? My ASA has only one static route which is 0.0.0.0 0.0.0.0 <Cisco 877 IP> in outside interface.

 

by: from_expPosted on 2009-04-28 at 22:10:24ID: 24257452

I suppose your ASA should have static route to cisco 3750

I'm not very clearly understand your IP addressing, but if it is like this:

<ASA[10.1.1.1/24]>----<[10.1.1.2/24]c3750[10.1.2.1/24]>----<2950>---<PC with an IP of 10.1.2.10/24 and GW to 10.1.2.1>

then static route for ASA would look like:
ip route 10.1.2.0 255.255.255.0 10.1.1.2

so we effectively tell ASA, that there is one more subnet within our network, which is located behind c3750.

In fact you can have several subnets behind c3750 and if you want all of them to be visible from ASA, then you should add static routes to all those networks.

20120131-EE-VQP-002

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