[K12OSN] Blocked net access

[Nakashima]

> John Lucas wrote:
>> Yes. Unless changes are made, your LTSP server is not set up as a 
>> router and won't pass packets from the "inside" network to the 
>> "outside" network. The terminals run processes on the server, which 
>> has access to both networks, but non-terminals attached to the 
>> "inside" do not have access to the outside. To keep the PCs on the 
>> inside and allow them out, you need to make several changes:
>> 	- turn on packet forwarding on the server (make it a router)
>> 	- give the server's inside address as a router in the DHCP stanza 
>> for the PCs
>> 	- make sure you don't have an IPTables rule preventing forwarding
>> 	- make sure your perimeter router knows the route back to the inside 
>> network
>> 	- make sure your perimeter firewall allows the inside network to 
>> forward
>> This is all basic TCP/IP networking 101 and is not specific to LTSP.
>
> K12LTSP should come with a script to do all of this, though.  Try
>  service nat on
> to start it and
>  chkconfig nat on
> to make it start automatically at boot up.  Your other routers 
> shouldn't
> need to know about the eth0 address range because outgoing packets
> nat to the eth1 address.  I thought this was normally set up during
> a default install.
>
> -- 
>   Les Mikesell
>     lesmikesell at gmail.com

Thanks John, Dan, and Les,
I did the following in Terminal

service nat start
chkconfig nat on

No luck.
I can ping addresses on the outside from an OS X  Mac, but can't get to 
the web with a browser.
I'm not very technical, so any further help you can provide will be 
greatly appreciated.
--Peter