Can't ping AP, but DHCP and inter-client pings work
Mon Sep 19 20:44:43 PDT 2005
I recently installed Ubuntu on a little computer of mine, and I'm having
a problem with wireless. I used to run a compiled-from-source HostAP on
Linux 2.6.6 (Debian), and it worked (i.e., the hardware is fine). I'm
now running Ubuntu's 2.6.12-8 kernel, which comes HostAP modules.
So, what *works*?
- I can run "ifup wlan0", which gives wlan0 a static IP, 192.168.2.100,
and calls iwconfig to set its name and essid. It is set to mode
- I can start a DHCP server on wlan0.
- From a wireless client, I can receive an address via DHCP.
- I can ping from one wireless client to another wireless client.
What *doesn't* work?
- I can't ping from client to access point or vice-versa.
- I can't connect to the Internet from clients (through the access
When I ping from client to AP and run tcpdump on the AP, I see some "arp
who-has" packets and nothing else. When I ping from the AP to the
client, tcpdump shows nothing at all.
I'd suspect routing tables, but they seem fine. Output from "ip route":
192.168.2.0/24 dev wifi0 proto kernel scope link src 192.168.2.100
192.168.2.0/24 dev wlan0 proto kernel scope link src 192.168.2.100
192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.100
xx.xx.xx.0/24 dev eth0 proto kernel scope link src xx.xx.xx.xx
default via xx.xx.xx.1 dev eth0
I only have one firewall rule:
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
(all policies are ACCEPT).
It seems like the answer must be obvious, but I just can't figure it
out. What could be wrong?
Adam Hooper <adamh at densi.com>
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