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2811 Stub Network Routing Error

abernhardt73
Level 1
Level 1

Hello Everyone:

I have spent hours putting together a "stub network," using SDM, for a single server behind a 2811 router with a HWIC-4ESW switch connected to the server's management port and its public ethernet port.

Each of the server's 2 ports is connected to one of the switch ports Vlan interface (its second ethernet port is not used).

Looking at server's public interface only for this running config detail.

FE0/0 will be connected to the ISP Ethernet cloud, currently setup with a laptop (A.B.78.1):

!

interface FastEthernet0/0

description $ETH-WAN$

ip address A.B.78.63 255.255.255.0

ip mask-reply

ip nat outside

ip virtual-reassembly

no ip route-cache

duplex full

speed auto

no mop enabled

!

interface FastEthernet0/0/0

description Public Interface

switchport access vlan 30

!

interface Vlan30

description Public Internet

ip address aa.bb.87.49 255.255.255.240

!

ip route 0.0.0.0 0.0.0.0 A.B.78.1 permanent

ip route aa.bb.87.0 255.255.255.240 aa.bb.87.50 permanent

!

The server's ethernet connection to vlan30 has an ipconfig: ip: aa.bb.87.50, mask: 255.255.255.240 & default gateway: aa.bb.87.49.

[1.] The router's Tools/Ping form will ping from FE0/0 to the server's ethernet aa.bb.87.50 -- no worries.

[2.] Similarly, the router's Ping Tool will ping from vlan30 to the laptop. (aa.bb.87.49 to A.B.78.1 = 100% 5/5).

Problems:

[1.] Using the command prompt ping tool from the server:

No ping from server aa.bb.87.50 to A.B.78.1. I can ping to A.B.78.63 (FE0/0).

[2.] Using command prompt ping tool from the laptop:

No ping from laptop A.B.78.1 to aa.bb.87.50. I can ping to aa.bb.87.49 (vlan30).

From looking at this, I think the problem is that the default routing to A.B.78.1 does not work for the vlan30 int traffic and that I need some sort of outbound vlan routing.

How do I do this? encapsulate? helper-address? There is a missing element here, and as frustration has taken over I cannot see it.

Can anyone point out the missing element?

Thanks in advance.

1 Accepted Solution

Accepted Solutions

Yudong Wu
Level 7
Level 7

What's the output of "show ip route" from 2800 router?

Do you know if default gateway (A.B.78.1) knows how to reach your aa.bb.87. network?

If your aa.bb.87. is a private IP, you need configure NAT on 2800 router.

View solution in original post

2 Replies 2

Yudong Wu
Level 7
Level 7

What's the output of "show ip route" from 2800 router?

Do you know if default gateway (A.B.78.1) knows how to reach your aa.bb.87. network?

If your aa.bb.87. is a private IP, you need configure NAT on 2800 router.

Hello kwu2:

That was it!

Even though the Vlans' SVI settings were setup with SDM, as a true l3 switch, this HWIC-4ESW has its IP routing turned off by default.

"ip routing" must be enabled through the CLI for each interface.

*reaches through computer monitor and shakes kwu2's hand*

Thank You!

...funny, I must be wrong, cuz I didn't think I was stupid.

Review Cisco Networking for a $25 gift card