Inter VLAN Route

Answered Question
Aug 9th, 2010

Hello everybody,

I have a cisco 3550 Switch and 2900 through fiber, I have configured 5 vlan on the 2900 and 3550.

on the 2900 I have created a Vlan Interface with the range for the vlan 4,

2900(config)# interface vlan 4
2900(config-if)#ip address 192.168.4.254 255.255.255.0

On the 3550 I have configured a DHCP Server for VLAN 3 and VLAN 4, 192.168.3.0/24 and 192.168.4.0/24

3550(config)# Interface Vlan 3

3550(config-if)# ip address 192.168.30.1 255.255.255.0

3550(config)# Interface Vlan 4

3550(config-if)# ip address 192.168.40.1 255.255.255.0

The Problem is:


When I connect a pc on the Vlan 3 I recive a valid IP address and I can ping the Vlan Interface with the range that belong to the Vlan 4 192.168.4.254 but I can no ping to the other pc on the Vlan 4.


When I connect a pc to the port that belong the vlan 4 I can ping to the Vlan Interface, but I can no ping to the other pc on the same Vlan 4.

From the switch 2900 I can ping to all VLAN Interface on the 3550 switch. 

I type show ip route command on the 3550 and all Vlan are connected.

Thank you.

I have this problem too.
0 votes
Correct Answer by Jayakrishna Mada about 6 years 4 months ago

Hi,

Check the firewall on the machine that you are not able to ping. Disable the windows firewall or other firewall to test

and/or configure them to allow icmp packets.

JayaKrishna

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Jon Marshall Mon, 08/09/2010 - 12:23

yiushongc wrote:

Hello everybody,

I have a cisco 3550 Switch and 2900 through fiber, I have configured 5 vlan on the 2900 and 3550.

on the 2900 I have created a Vlan Interface with the range for the vlan 4,

2900(config)# interface vlan 4
2900(config-if)#ip address 192.168.4.254 255.255.255.0

On the 3550 I have configured a DHCP Server for VLAN 3 and VLAN 4, 192.168.3.0/24 and 192.168.4.0/24

3550(config)# Interface Vlan 3

3550(config-if)# ip address 192.168.30.1 255.255.255.0

3550(config)# Interface Vlan 4

3550(config-if)# ip address 192.168.40.1 255.255.255.0

The Problem is:


When I connect a pc on the Vlan 3 I recive a valid IP address and I can ping the Vlan Interface with the range that belong to the Vlan 4 192.168.4.254 but I can no ping to the other pc on the Vlan 4.


When I connect a pc to the port that belong the vlan 4 I can ping to the Vlan Interface, but I can no ping to the other pc on the same Vlan 4.

From the switch 2900 I can ping to all VLAN Interface on the 3550 switch. 

I type show ip route command on the 3550 and all Vlan are connected.

Thank you.

Your vlan 4 interface on the 2960 is not in the same subnet as the vlan 4 interface on the 3550. Should the vlan 4 interface on 3550 be 192.168.4.1. Also with the DHCP scope the default-gateway for vlan 4 must be the vlan 4 IP on the 3550 and not the 2900 as the 2900 is only a L2 switch.

Jon

yiushongc Mon, 08/09/2010 - 12:34

Sorry I had a mistake when I type the IP address. The IP address for the vlan 4 on the 3550 is 192.168.4.1 sorry it was my bad.

Another thing, I get a valid IP adress for the 3550 DHCP server in  Vlan 3 and 4 but when I type on the 3550

show ip dhcp binding

It show me the IP that the DHCP server give to my PC but I cannot ping from the 3550 to my PC and is in the same subnet 192.168.4.0/24. However i can ping from my PC to the 3550 VLAN interface 192.168.4.1/24

PS: I have 3 2900 on stack.

Any sugestions ??

yiushongc Mon, 08/09/2010 - 13:33

Now I see that all IP  Vlan Interface on both switches can ping from any location (Switch and PC) but the Machine IP Address cannot ping either Switch or PC.

Somebody have any idea  ?

Thank you so much.

Correct Answer
Jayakrishna Mada Mon, 08/09/2010 - 13:44

Hi,

Check the firewall on the machine that you are not able to ping. Disable the windows firewall or other firewall to test

and/or configure them to allow icmp packets.

JayaKrishna

yiushongc Mon, 08/09/2010 - 14:05

Wow thank you so much JayaKrishna, that is the problem, my firewall setting on my PC, I disable my firewall and works. But I don't know why with the my firewall configuration before work the ICMP and when I connect to the Vlan the firewall block the ICMP packets ?

So whatever thank yuo so much.

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