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Beginner

iMac and 2800 router problems

I have a 2800 router that works just fine with about 50 PCs and 1 other Mac. When I connect the new iMac 27" to my network I can't get to the internet. It shows all the correct addresses and can see everything on my LAN, but can't see out past the router. If I put a cheap netgear router between the iMac and the 2800 and double NAT, I can get to the internet. What could be wrong with the router, or iMac? Could there be a firmware update for the router? All of the updates for the iMac have been applied, and it's running 10.2.6. Any ideas? Thanks.

15 REPLIES 15
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Enthusiast

Re: iMac and 2800 router problems

Richard,

I assume you meant OS X 10.6.2

When you have your iMac connected to the 2800, does it show a default gateway in its routing table?

Run this command on a terminal session on the iMac:

netstat -rn

and see if there is an entry that states "default" with the IP address of your router.


For example:

% netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags        Refs      Use   Netif Expire
default            192.168.1.1       UGSc       147238        0     en0

Highlighted
Beginner

Re: iMac and 2800 router problems

Yes, i ment OS X 10.6.2.

When I run the netstat -rn the gateway is shown, and it is the correct address for the router.

To get the system running and working on my network I have it conntect to a wireless router that routes through the 2800 to get her internet access, and have the wired connection on a static manual ip without the gateway address. It lets me see our internal network and gives us internet access for now.

I appreciate your help. Any other ideas?

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Enthusiast

Re: iMac and 2800 router problems

With the iMac not connected to the wireless network and after verifying that the default route points to the 2800, can you do a traceroute to some address on the Internet and post the results here?

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Beginner

Re: iMac and 2800 router problems

Sorry it took so long to get back in here. I tried the traceroute and it failed. I can ping other computers and I can ping the router.  Any other ideas or things to try?

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Enthusiast

Re: iMac and 2800 router problems

What do you mean by "it failed"?


Can you please post the output of the traceroute?

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Beginner

Re: iMac and 2800 router problems

Traceroute: unknown host www.cnn.com

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Enthusiast

Re: iMac and 2800 router problems

Try tracerouting to an IP address rather than a hostname.

For example, traceroute  157.166.226.26

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Beginner

Re: iMac and 2800 router problems

Not sure if you saw my reply, so I'lll post it again.

Rose-Horenskys-iMac:~ rosehorensky$ traceroute  157.166.226.26

traceroute to 157.166.226.26  (157.166.226.26), 64 hops max, 52 byte packets

1  192.168.1.221 (192.168.1.221)  1.226 ms  0.879 ms  0.745 ms

2  * * *

3  * * *

4  * * *

5  * * *

6  * * *

7  * * *

8  * * *

9  * * *

10  * * *

11  * * *

12  * * *

13  * * *

14  * * *

^C

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Beginner

Re: iMac and 2800 router problems

Make sure the Airport wireless card is turned off.

Highlighted
Beginner

Re: iMac and 2800 router problems

Yes, I turn off the air card, and turn on dhcp on the wired for each of the tests. With the air card on, everything works just fine. Here are the results from using the ip for cnn.com. I stopped it after 14 hop tried.

Rose-Horenskys-iMac:~ rosehorensky$ traceroute 15.166.226.26

traceroute to 15.166.226.26 (15.166.226.26), 64 hops max, 52 byte packets

1  192.168.1.221 (192.168.1.221)  0.985 ms  1.026 ms  0.818 ms

2  * * *

3  * * *

4  * * *

5  * * *

6  * * *

7  * * *

8  * * *

9  * * *

10  * * *

11  * * *

12  * * *

13  * * *

14  * * *

^C

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Beginner

Re: iMac and 2800 router problems

Sorry, I mistyped on my traceroute, but have the same results.


Rose-Horenskys-iMac:~ rosehorensky$ traceroute 157.166.226.26

traceroute to 157.166.226.26 (157.166.226.26), 64 hops max, 52 byte packets

1  192.168.1.221 (192.168.1.221)  1.226 ms  0.879 ms  0.745 ms

2  * * *

3  * * *

4  * * *

5  * * *

6  * * *

7  * * *

8  * * *

9  * * *

10  * * *

11  * * *

12  * * *

13  * * *

14  * * *

^C

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Contributor

Re: iMac and 2800 router problems

can you ping external IP addresses? try a ping to 4.2.2.2 - if that responds try a traceroute to 4.2.2.2 with the -n flag

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Beginner

Re: iMac and 2800 router problems

No, can't ping to anything outside the local network, even dns addresses. I can't see beyond the Cisco router using the wired adapter. Don't give up guys. There has to be some crazy reason for this. Any idea what the packets look like coming from the iMac? Does Snow Leopard do something new and fancy or strange?

Highlighted
Contributor

Re: iMac and 2800 router problems

can you post the config of the 2800?

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