Can't create Network with Airport

Snow leopard is riddled with networking issues (particularly wifi). I've had nothing but problems with my imac since the upgrade. The airport dropouts are so frequent that I can barely connect to the internet with safari or mail, and wireless printing and music streaming through my two airport express units has been dead for ages. At this stage, I'd be happy with some acknowledgement that there is a major issue and it's being worked on.

i have this stupid issue of 3 Macs (iMAC, Macbook & Air)

but i found sth solution with internet, but just gd for my Air, everyone can try this>>>>>

Turn off internet sharing.

Go into system preferences -network

Click on Airport in the left hand side, then click 'advanced' on the right hand side'

Click TCP/IP and turn 'Configure IPv4 to Off

Click OK, then click 'Apply' in the network window.

Turn internet sharing back on.

After that I am now back to normal and my network is up and running again without problems.

Hi all I am joe, from HongKong

i real all with this issue of internet sharing, find many post at forum,
but still doesn't , but i saw my FR is using 17" Macbook Pro 2.6 (last GEN, all silver), it's work actually,
really dun know why !! also the latest update(10.6.2) still doesn't work with internet sharing

i have worked B4 apple repair center, and find a solution is chatting with apple genius, it's called TSSP.

hope last messeage can help someone.

The only approach which worked for me is creating your own dnat.
Here is source:
http://www.macosxhints.com/article.php?story=20050331194834746&query=internet%2B sharing

Here I my steps:
1) I have created new network location (to preserve my regular air port configuration)
2) I have set my airport ip address to 10.0.0.1 with mask 255.255.255.0
3) I have created new network (right clicking on my air port icon)
4) I have connected device to which I want share internet (in my case iphone 3g 😉 ) to this network assigning it static ip 10.0.0.2 and router 10.0.0.1
At this point I was able to send ping from my mac to my mobile.
5) I have called following from commandline (192.168.10.10 is ip address of my en0 interface which I am using to connect to net):
sudo sysctl -w net.inet.ip.forwarding=1
sudo /usr/sbin/natd -alias_address 192.168.10.10 -interface en0 -use_sockets -same_ports -unregistered_only -dynamic -clamp_mss
sudo ipfw add divert natd ip from any to any via en0

I am pretty sure this is not easiest way to get connected ... anyway this worked for me 😉

On the Mac Mini, I had the same error as most people in this tread, while trying to create an ad-hoc network ("+There has been an error creating a computer to computer network+").

Installing 10.6.2 didn't fix it, however:
_After installing 10.6.2, there was another update available:_
*"Airport Client Update 2009-002"*

This update solved the problem, now it finally works!

Just confirming the post by EATADDjoe SOLVED for my case. Many thanks!!

To recap his recommendation:
(With Internet Sharing temporarily off:)
SystemPrefs>Network>AirPort>>Advanced>TCP/IP>
Configure IPv4>>OFF

Clarified by: Elise Springer

I cannot share my VPN connection from Mac. Is there anything else that I have to do to share my VPN?

Hi all,

I'm not sure if my problem is 100% like the others listed here but sounds close. I have 4 Macs at home and 3 of them work fine with my new Extreme (dual aerial). However, the older Mac Mini2,1 cannot see the base station. All of the macs have 10.6.4 on them.

The mini does not show the base station at all. I moved it down right beside the base station, hooked it up directly to LAN port then all of a sudden the airport (G, not N) was visible. Took the computer 50 feet away where I want it on a desk and it can't see anything again! Even though the MacBook Pro, MacBook and iPhone can all see the base station from the same location?

Any ideas?