ARP over Computer-to-Computer Network with WEP?

Howdy All,
I have two Macs running OSX 10.4.8. I want to connect them with a Computer-to-Computer Airport network (not an Airport Base Station) with static IP routing between them, but NOT using Internet Sharing.
If I setup the Computer-to-Computer networking using WEP then ARP packets don't seem to get through (across the wireless). If I recreate the Computer-to-Computer networking without the WEP then the connection works fine.
When I setup a Computer-to-Computer networking in Airport does it filter ARP packets for some reason (or perhaps it doesn't need them with Internet Sharing)? Can I create a computer to computer network some other way?
I don't want to use Internet Sharing because of the NAT it creates.
Thanks in advance for any advice / suggestions.
Cheers,
Ashley.
Ashley Aitken
Perth, Western Australia
mrhatken at mac dot com email

Hi BDAqua,
Thanks for your post. Unfortunately, I don't believe I explained things clearly. I am trying to do IP routing from one machine to the other without using the NAT that Internet Sharing would give me.
I can get it to work fine when I have a computer-to-computer network without WEP security, e.g. I can ping each machine from the other. However, if I recreate the c-to-c wireless network with WEP it doesn't work.
A tcpdump suggests that the ARP packets aren't getting through the computer-to-computer network when WEP is on. Here is a portion of the output from tcpdump:
18:46:43.826657 arp who-has 192.168.49.7 tell 192.168.49.4
18:46:44.949274 arp who-has 192.168.49.7 tell 192.168.49.4
18:46:45.950094 arp who-has 192.168.49.7 tell 192.168.49.4
18:46:47.074291 arp who-has 192.168.49.7 tell 192.168.49.4
18:46:48.075014 arp who-has 192.168.49.7 tell 192.168.49.4
18:46:57.361050 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 113
18:46:59.448638 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 129
18:47:02.463678 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 94
18:47:03.528851 IP 192.168.49.4.ipp > 192.168.49.255.ipp: UDP, length: 146
Of course, both machines have the same WEP password etc. It may be something to do with how Apple creates the c-to-c wireless network when WEP is used, I don't know.
Hopefully that makes it clearer. BTW, Personal Filesharing was on and the Firewall was off in both cases.
Cheers,
Ashley.
Here are more details if it will help:
I have two Macs A & B.
A has created a wireless network called W (using the Airport menu extra).
A has IP address 192.168.49.4
A has a static route 192.168.49 -interface en1
A has IP forwarding on
A also has a wired network connection elsewhere ...
nestat -nr shows:
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.1.1 UGSc 17 16 en0
127 127.0.0.1 UCS 0 0 lo0
127.0.0.1 127.0.0.1 UH 14 16341 lo0
169.254 link#4 UCS 0 0 en0
192.168.1 link#4 UCS 4 0 en0
192.168.1.1 0:50:7f:23:cf:be UHLW 16 0 en0 1198
192.168.1.2 0:c1:26:10:61:a6 UHLW 1 236 en0 520
192.168.1.4 127.0.0.1 UHS 0 10 lo0
192.168.1.255 link#4 UHLWb 1 552 en0
192.168.20 192.168.1.2 UGSc 0 0 en0
vvvvvvvvvv
192.168.49 link#5 UCS 2 0 en1
192.168.49.4 127.0.0.1 UHS 0 38 lo0
192.168.49.7 link#5 UHRLW 4 4371 en1 16
192.168.49.255 ff:ff:ff:ff:ff:ff UHLWb 0 4 en1
^^^^^^^^^^
B has connected to the wireless network called W (using the Airport menu extra).
B has IP address 192.168.49.7 with router 192.168.49.4
B has a static route 192.168.49 -interface en1
B has IP forwarding on
B has a wired network connection to a printer ...
netstat -nr shows similar (but reversed, i.e. 4 and 7) for en1.
This is NOT using "Internet Sharing" (i.e. it is off). I don't want the NAT that comes with that!
System preferences shows both machines are connected to the "Computer-to-Computer" network W.
Pinging the other machine from either side I get:
ping: sendto: Host is down
ping: sendto: Host is down
ping: sendto: Host is down
ping: sendto: Host is down
ping: sendto: Host is down
ping: sendto: Host is down
ping: sendto: No route to host
Again, if I create the network without WEP security with the same configuration, the pings work fine.
PowerMac G5 Single CPU + AL PowerBook G4 Mac OS X (10.4.8)

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