OSX 10.6.8 and Internet Sharing to Ethernet

[robert-a-hudson]

I am trying to set up Internet Sharing so that I can connect my old MacBook Pro running 10.6.8 via ethernet to another device - I'm trying with xbox360 and Sony Blu Ray (BPD-S185) (for diversity of devices - I used to have it working on my xbox, but really want it working with the blu ray player but the network status feedback is better for problem solving on the xbox!).

I have my MBP connected to my home network over Airport which has the following details:
- IP: 192.168.1.5
- Router IP: 192.168.1.1

I have then enabled Internet Sharing through System Preferences to share my Airport connection to my Ethernet connection.

I have the following Ethernet settings:
- Configure IPv4: Using DHCP with manual address
- (Ethernet) IP address: 192.168.2.1
- Subnet Mask: (blank - not user accessable, changes to 255.255.255.0 when xbox turned on)
- Router: (blank - not user accessable)
- DNS Server: 192.168.1.1
- Search Domains: (left blank)

On the xbox I've set the network settings to:
- IP: 192.168.2.2
- Subnet: 255.255.255.0
- Gateway: 192.168.2.1
- Primary DNS: 192.168.1.1
- Secondary DNS: 192.168.2.1

When I then select 'Test my Xbox Live Connection' it takes a while, the Network status shows 'Connected', however The Internet Failed. I am informed that the 'Test Failed' and 'more information' tells me I have an 'Internet Error' with the following Status codes:
W: 0000-000B
X: 0000-000D
Y: 0000-0000
Z: 0000-0000
ID0004-000
L: 0015-10F1
Q: 8007-0435
T: Wired
A: 192.168.2.2/255.255.255.0
G: 192.168.2.1
D: 192.168.1.1/192.168.2.1

So, it looks as though the problem lies with the MBP and internet sharing on OSX. I have extra suspicions that this is the problem, as connecting my Blu Ray player to my MBP via ethernet I also get a successful connection to the network, but no internet access.

Pleeeeease can someone help?!?! This is driving me nuts - a couple of years ago I had internet sharing working to let my xbox connect to the internet, so what's happened in the last few years to mean this won't work?

 

[drambuie]

What happens if you change your subnet mask to 255.255.254.0? You have two subnets 192.168.1.1 and 192.168.2.1, and the subnet mask of 255.255.255.0 will only allow one.

 

[robert-a-hudson]

What happens if you change your subnet mask to 255.255.254.0? You have two subnets 192.168.1.1 and 192.168.2.1, and the subnet mask of 255.255.255.0 will only allow one.

I have tried changing the subnet mask for the ethernet to 255.255.254.0 as suggested. I have done this both on the Xbox settings and on changed the OSX Ethernet Network Settings to 'Manual' and specified the subnet mask there.

However, I don't get any improvement with this setting - the xbox connection still fails at the same point.

Again, this seems to be pointing to internet sharing not working as it should on OSX perhaps? Does anyone have any further suggestions?

Thanks,
Robert

 

[robert-a-hudson]

*Bump*

Just wondering if anyone had any suggestions?

 

[abrennan]

Try changing the mask to 255.255.252.0. The .254.0 mask
only allows 192.168.0.0 and 192.168.1.0, so you can't get a
192.168.2.x address to be in the same network until you've
opened it up to 4 /24 blocks - or .252.0.

It's one of those subnet address math issues. You want two
networks, but because the ones you want are at the "edges"
of two different bitmasks ... you need to make your network
a little bit larger.