Sharing dial-up connection

R

rijdat

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I have an iBook with (old) Airport talking to a G5 through a D-Link 624+ wireless router (UK version). All running 10.3.7 and the G5 is connect to the internet through its modem. Although the iBook's Sharing pref panel tells me I am connected to the internet I cannot browse (or ping), even with both Firewalls off. I have also tried with ports 80 and 443 passing through both Firewalls as recommended in several places.

Any ideas ?
 
First the internet sharing on the iBook should be off. Next turn the firewall off on both machines. You will want to turn it back on later but this is to eliminate it as a potential problem.

1) On the G5 open Sharing. Internet sharing should be on and sharing from the Modem to computers using ethernet. (Would be easier if you had an airport on the G5 by the way)
2) On both the iBook and the G5 open the Network utility. Make note of what address is assigned to:
a) the G5 ethernet card
b) the G5 modem
c) the iBook airport

3) From the iBook network utility try and ping the ethernet on the G5.

I am guessing this step is going to fail. If so please post the addresses of the G5 ethernet and the iBook airport (but not the modem address). I am guessing you are using the DHCP on the Access point and connecting the G5 to the WAN port. You would be better off disabling dhcp and nat on the access point and putting the G5 on one of the normal ports (if there are any)

4) If by some chance it does not fail try and ping the modem IP address. If that works then... I am not sure.
 
I didn't read anything about the lan connection. Do you get a proper ping between the G5-ip and the ibook-ip from both machines?
 
Mephisto, thanks for this. I have the G5 connected to the Ethernet ports of the router and not the WAN port. I can ping the ethernet on the G5 but not the modem. I have tried turning off the DCHP server on the router (don't see how to turn off NAT but perhaps this is the same) but this makes no difference. Thanks.
 
You do not have to turn off the nat if you do not use the WAN port and DHCP is off. I did a little reading and from what I can tell you have to turn in internet sharing for a modem after you have connected to your ISP. Not sure if this is still true but something to keep in mind none the less.

On your iBook go to System Preferences => Network, show the Airport. Under the TCP/IP tab for the Airport what does it have for IP address and Router? Does the value for Router match the IP address for the Ethernet on the G5? If not what are the values for the built in ethernet on the G5?

Since you are able to ping the G5 you are at least communicating between the IBook and the G5. The fact that you had DHCP active on your Access Point was possibly part of the problem. When you are doing internet sharing from a Mac the port from which the MAC is sharing hosts a DHCP server. So at least for a while you had 2 DHCP servers hosting IPs at the same time which would lead to some trouble,

What we are trying to get to is for the router entry on your iBook to be the address of the ethernet on the G5. If the router does not match try clicking "Renew DHCP Lease" on the iBook and see if it corrects itself now that the WAP is not giving out addresses.

Depending on what the values are what we might try next is setting up a static IP on the iBook for debugging purposes to see if you can route out then.
 
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