Vlan routing fail

[paulc]

Hello, I am having trouble getting routing to work properly between two vlan's: Vlan2 and Vlan15 using a 2950 and 4510 core switch.

On the 2950:

    fa02 VLAN15

    fa0/12  switchport mode Trunk

From my computer, I can ping with success the pc on Vlan15.

The pc on Vlan15 can ping with sucess my computer.

However, the pc on Vlan15 CANNOT ping anybody else.

Particulars:

Vlan2  192.68.x.x

Vlan2 pc (mine)  192.168.100.1

4510 Vlan2   192.168.103.6

     Vlan15  172.30.1.1

Vlan15 pc 172.30.1.10

172.30.1.10 can ping 172.30.1.1 and 192.168.100.1 but not 192.168.100.10

192.168.100.1 can ping 172.30.1.1 and 172.30.1.10

Finally, other pc's on vlan2 can ping 172.30.1.1 (g/way vlan15) but not the

pc on Vlan15.   

[Reza Sharifi]

Vlan2  192.68.x.x

shouldn't this be 192.168.x.x?

[paulc]

Typing error, Reza. Yes, it is 192.168.x.x

[Thotsaphon Lueangwattanaphong · Accepted solution]

Hi,

   Please post the output of "show ip route" and "show running" on C4510.

   Make sure that you alreadly created VLAN-15 and VLAN-2 in C2950 and C4510. "show vlan" will reveal it.

   Make sure that you correctly configured the gateway on PCs of each VLAN.

HTH,

Toshi

[manish arora]

If the Gateways are configured right , Please check of any windows firewall or anti-virus firewall stopping the ICMP packets or any ACL on the gateways blocking the ICMP packets.

Manish

[paulc]

F/W and a/v aren't an issue.

On the vlan15 pc, I have gateway as 172.30.1.1 (int vlan 15 shows 172.30.1.1)

On the 192.168.x.x, I have gateway as 192.168.103.6.

Sorry, it was vlan1 not vlan 2.

ADDITIONAL

Okay, now it gets stranger.  I can now ping, successfully, 192.168.100.10 through 192.168.100.17.  Those are out hospital EMR servers. I still can't get a connection to my DNS servers, though.  (However, by adding an entry for x.x.x.10 to the Hosts file, I can run the EMR s/w.)

I checked the IP settings on x.x.x.10 and they are similar to x.x.x.1 differing only in IP address.

[Reza Sharifi]

Can you post the relevant configs from the 2900 and 4500 switches?

[glen.grant]

  Make sure your masking is correct on all devices , this can lead to strange results if they are not all the same.

[paulc]

Got to give you credit for this one.  (And kick myself for assuming a fact not in evidence.)  The gateway on the DNS server was set to our firewall.* Sorry for the confusion.

*A long time ago when we had a very small network, engineeers from Data General (remember them?), set up the network and used the firewall for the gateway since we only had one vlan.