[ale] more on the IP/MASQ question, need help

[Dave Brooks]

Do you have a default route for eth1 pointing to eth0?

# route add default gw <eth1_ip_address> dev eth0

Also, when in doubt, check Rusty's 3 Line Guide to Masquerading:
http://www.linuxdoc.org/HOWTO/IPCHAINS-HOWTO-3.html#ss3.1

Enjoy!

Dave


On Thu, Sep 23, 1999 at 04:24:43PM -0400, jj at spiderentertainment.com wrote:
>Ok, here's the nfo, and what I did do.
>I have 2 windows machines and 1 linux, RH6.0 just installed.
>
>Linux (two network cards, both are working)
>eth0 is connected to cable modem (DHCP) via rj45
>eth1 is connected to the windows machines via coaxal cable.
>Linux machine can see the internet.
>
>Windows machines can see the linux box, both nics (eth0, eth1), but they
>can not see the internet.
>
>I'm not at home right now, but this is what I did(from my memory).
>eth0: ip address assigned by the DHCP server
>eth1: 10.0.0.1    Netmas 255.255.255.0 on all for 10.0.0.
>Windows 1: 10.0.0.2 gateway 10.0.0.1
>Windows 2: 10.0.0.3 gateway 10.0.0.1
>
>enabled the /proc.../ip_forward
>loaded the ip_masq_autofw
>
>test1: (same as in the HOWTO)
>ipchains -P forward DENY
>ipchains -F forward -j MAS -s 10.0.0.0/255.255.255.0 -d 0.0.0.0/0
>I also used the ipchains input for DHCP as described in the HOWTO
>
>since that did now work, I thought maybe it gets confused on which nic to MASQ.
>
>so I did this:
>
>ipchains -F forward -j MAS -s 10.0.0.0/255.255.255.0 -d 0.0.0.0/0 -P all -i
>eth1
>
>Then I switched to ipfwadm, I knew this will not work, but I tried it
>anyways...
>
>help ?
>
>
>
>
>Joe Knapka wrote:
>
>> You have, of course, invoked the magical incantation known
>> as "Rusty's 3-line Guide to IP Masquerading" from the
>> IP-Masq HOWTO, correct? Including the all-important
>> "echo 1 > .../ip_forward"? And you have set all the Windows
>> machines to use the Linux box as their gateway?
>>
>> -- Joe
>>
>> jj at spiderentertainment.com wrote:
>> >
>> > Ok, I give up, please help.
>> > This is what I got so far:
>> >
>> > 2 machines are windows, 1 is linux RH6.0(just installed)
>> >
>> > Linux:
>> > it has 2 network cards, both are working perfectly.
>> > Eth0 is connected to a cable modem via RJ45.
>> > Eth1 is connected to the other two windows machines via coaxal cable.
>> >
>> > Windows machines: work perfectly, they talk to linux(ping, telnet, etc)
>> >
>> > >From windows I can ping eth0 and eth1 but I can not seem to go outside, I
>> > can not ping anything on the net.
>> >
>> > Can ya help ?
>> >
>> > Thank you.
>>
>> -- Joe Knapka
>> * I speak only for myself, not for these idiots:
>> * The Software Monastery - "Better Software Through Divine
>> * Intervention." Source-code prayer vigils available - nominal
>> * donation $0.01/LOC. http://whyme.penguinpowered.com/monastery.html

-- 
david a. brooks
dbrooks at comstar.net
systems engineer
comstar.net, inc.
voice: .. 770/485-6029
pager: .. 770/213-6133