Routing over Airport?

[Ashley Aitken]

Ok, I just tried making the wireless network *without* WEP and the  
connection now works.

I read a little about ARP security holes with WEP.  Is it possible  
that Apple's WEP restricts ARP packets on the wireless network?   
Could Macs get buy without it when using "Internet Sharing" (i.e. a  
NAT)?

Of course, I don't want to run the wireless network without security  
(no matter how bad WEP is ...).  Does this help anyone with a solution.

At least, I know it (most likely) isn't something I am doing.

Cheers,
Ashley.

On 28/12/2006, at 7:03 PM, Ashley Aitken wrote:

>
> Howdy All,
>
> I'm back trying to route IP over Airport (not even bridging just  
> routing).
>
> 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
> ...
>
> As Justin suggested before, I have used tcpdump for en1 (the  
> wireless network) and get this:
>
> 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
>
> And similar (but reversed, of course) on the other machine.  It  
> looks like the ARP request is not getting out across the wireless  
> network or the response is not getting back.
>
> Can anyone suggest please what I may need to do?
>
> I thought the wireless network would work just like an ethernet  
> cable when connected and routing would then work as normal.
>
> What am I missing?  Should this just work?
>
> Thanks in advance.
>
> Cheers,
> Ashley.
>
> --
> Ashley Aitken
> Perth, Western Australia
> mrhatken at mac dot com
> Skype Name: MrHatken (GMT + 8 Hours!)
>
>
>
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