Two VLANs -- can ping only in one direction

Answered Question
Aug 17th, 2010

Hi experts!

I have a Cisco 881w router, which has a built-in WLAN module. Technically it has to be configured as two separate devices with two separate VLANs and subnets (one of each for WLAN and one of each for LAN). So, I have used default VLAN1 for the LAN subnet 192.168.0.0/24 and created a new VLAN10 for the WLAN subnet 192.168.1.0/24.

Everything works fine, including NAT, I can access Internet from both subnets (i.e. from both, clients in LAN and clients in WLAN). I also can ping from a client in the LAN (VLAN1) to a client in the WLAN (VLAN10).

But: I can't ping vice versa, so I get no response when I ping from WLAN (VLAN10) to LAN (VLAN1). Any ideas what could be the problem here? I have attached both configs, from the normal router module and from the WLAN module.

Thanks in adavance for your help!

Kind regards, Matthias

I have this problem too.
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Correct Answer by milan.kulik about 6 years 5 months ago

Hi,

generally, 99% of Ping working in one direction only problems are caused by a (personal) FW involved.

Are you able to Ping from one device in VLAN1 to another in the same VLAN?

If yes, are you able to Ping from your router to a device in VLAN1? And from VLAN10 to your router VLAN1 interface?

BR,

Milan

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Correct Answer
milan.kulik Tue, 08/17/2010 - 01:04

Hi,

generally, 99% of Ping working in one direction only problems are caused by a (personal) FW involved.

Are you able to Ping from one device in VLAN1 to another in the same VLAN?

If yes, are you able to Ping from your router to a device in VLAN1? And from VLAN10 to your router VLAN1 interface?

BR,

Milan

MatthiasGTW Tue, 08/17/2010 - 01:17

Hi Milan,

you were absolutely right, the problem came from the the Win7 firewall.

After disabling it for this test I was able to ping in both directions.

Thanks a lot!

Kind regards, Matthias

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