[SOLVED] RPI Hotspot broken in latest release? (it's not)

[joebloggs]

Hi,

I've been trying to follow http://elinux.org/RPI-Wireless-Hotspot but it seems that the iptables rules aren't working, from peoples reports in the forum this is only the case on the latest release. ,

Does any one know of any changes between the feb and june releases that may impact this?

Kind Regards,

Jo

[SirLagz]

the way iptables works shouldn't change between releases.
Can you run iptables -t nat -L and iptables -L and paste the results ?

[joebloggs]

sudo iptables -t nat -L

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sudo iptables -t nat -L 
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  all  --  anywhere             anywhere    

sudo iptables -L

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Chain INPUT (policy ACCEPT 756 packets, 76075 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 ACCEPT     all  --  eth0   wlan0   anywhere             anywhere             state RELATED,ESTABLISHED
    0     0 ACCEPT     all  --  wlan0  eth0    anywhere             anywhere            

Chain OUTPUT (policy ACCEPT 434 packets, 47667 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Thanks for your help,

Jo

Thought I better add a bit more information - I followed the guide linked to in the first post.

The Pi now hosts an encrypted wifi network, using my laptop I can connect to that wifi network. I can login to the pi over ssh and from the pi can see the internet. But from my laptop, I don't have internet connectivity.

Could there be anything else that I've missed?

[SirLagz]

iptables looks fine.
can you ping IP addresses in the intarwebs from the laptop ?
Perhaps DNS lookup isn't working correctly

[joebloggs]

Nope, I can't ping internet IP addresses from the laptop.

I can ping (eg google.com) from the PI when logged into it over ssh from the laptop.

--Edit--

Ok, so I've looked at the routing information, and the difference between being connected to the pi vs. my home wifi is that when connected to the PI the doesnt seem to be a 'default' route in the routing table information which is displayed when I type 'route'.

So I'm going to try to find how to add a default route and and get it added on startup, I'll report back if I get it working.

-- 2nd Edit --

I've added a new default route on my laptop by typing: route add default gw 192.168.42.1 and now when pinging from my laptop I get a bit more, rather than saying "connect: Network is unreachable" immediately, it now seems to try and then gives me "ping: unknown host google.com"

If I ping an internet IP directly (I used an IP that I got from the ping of google.com from the pi) I simply don't get a reply

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PING 173.194.41.161 (173.194.41.161) 56(84) bytes of data.
^C
--- 173.194.41.161 ping statistics ---
57 packets transmitted, 0 received, 100% packet loss, time 56449ms

[SirLagz]

Can you paste the configuration for the DHCP server you're using ?

[joebloggs]

I'm using udhcpd as per the guide, my config file /etc/udhcpd.conf looks like this:

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start 192.168.42.2 # This is the range of IPs that the hostspot will give to cl$
end 192.168.42.20
interface wlan0 # The device uDHCP listens on.
remaining yes
opt dns 8.8.8.8 4.2.2.2 # The DNS servers client devices will use.
opt subnet 255.255.255.0
opt router 192.168.42.1 # The Pi's IP address on wlan0 which we will set up sho$
opt lease 864000 # 10 day DHCP lease time in seconds

Thanks for you help with this SirLagz, it is appreciated.

[joebloggs]

Ah! I've found it.

For some reason I commented out the driver line in /etc/hostapd/hostapd.conf

I'm not sure why i did that, maybe because I thought it was already working it didnt need it? Apparently it is quite important.

Thanks so much for your help SirLagz, but we can put this down to my mistake!

[SirLagz]

No problems !