Internet works, but pinging doesn't???

**mitaux8030** · 03-08-09, 09:27 PM

Not going to get too worried by this, but I'd really like to know something...

while diagnosing a problem that went something like:
wireless USB 'stick' on the PC in question was associating OK to access point but decided to use an IP address outside the DHCP pool range (wtf?) so I changed everything over to static IPs.

The internet worked fine after that, but for some wierd reason I can't ping the AP from the PC in question (can ping myself), and no other PC connected to the AP can ping the PC in question. Can't ping google.com or my ISP, but I can see that the DNS resolves OK. ARP tables can see everything on the network, including other PCs associating with the AP.
Why does the ping not work, but everything else does???

**Fernbay** · 03-08-09, 09:30 PM

Because it is turned off by default in the modem/router.

Log on to the webIf & turn it back on if you want.

It is off by default because if you turn it on it can become a becon for hackers

**mitaux8030** · 03-08-09, 10:03 PM

OK that's interesting... I never thought about that aspect. But why can all the other PCs on that AP ping the router / AP / each other / addresses on the net

**Redwight** · 04-08-09, 07:31 PM

Originally Posted by mitaux8030

OK that's interesting... I never thought about that aspect. But why can all the other PCs on that AP ping the router / AP / each other / addresses on the net

A couple of the Cisco wireless products we have at work can be interfaced using HTTP prompts but cant be pinged; the reason is encryption. An encrypted ping is just gibberish to the host device, maybe this relates somehow?

**SystemRat** · 04-08-09, 08:15 PM

Re other devices on the network not being able to talk to each other.

I have a LinkSys wireless router and the wired network devices could not share to the wireless devices. This had me going for a while till I found the access point isolation setting in the router. This is a VPN business router so I am not sure if these settings are an option in domestic units.

This is the routers help text on the feature.

AP Isolation

When you setup multiple VLANs, PCs that are associated to different SSIDs will not be able to see each other. Disable this option if you would like them to see each other when associated to different SSIDs.