cant ping my machines

[the_y_man]

so this is my setup, very self explanatory:
[img:c0133972f3]http://www.student.yorku.ca/~crazyguy/mysetup.gif[/img:c0133972f3]
http://www.student.yorku.ca/~crazyguy/mysetup.gif

the blue, green an yellow machines can ping each other including the red machine, but the red machine cannot ping the other machines, it can only ping the SMC router...

whe i run ifconfig on my red machine i get:

[flavio]

You may need to disable either NAT or packet filtering in your SMC router in order to allow the red box to access the other boxes.

[think4urs11]

if the SMC is one of the various cheap NAT routers (afaik it is) then you can't!
If at all it might be possible to ping one box behind it. Therefore you'd have to configure a forwarding for everything from outside (the segment 'red' is in) to be forwarded to e.g. 'green'.
Depends on whether the SMC can forward ICMP at all or handles this only by itself...

HTH
T.
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[Frodg]

Is the router fitted with a firewall function or is this part of the red machine's function........? A disabling the function on the router (if it is there) should allow the ping - then reenable it !!!
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Gentoo - Registered Linux User # 361400