after *endless* months trying to live with a NT internet server which
performed horribly and crashed regularly (the record was 19 times in
*one* hour), the management at my company at last agreed to try out
a machine running RedHat linux. hurrah! BUT i'm having a problem
with forwarding IP traffic between two ethernet cards.
------ +------------------+
---- router --------| aaa.bbb.ccc.dde |
------ | |
aaa.bbb.ccc.ddd | "A" |
| |
| |
| 10.10.10.101 |----+
+------------------+ |
|
| +--------------+
------- | "B" |
| hub |---| 10.10.10.201 |
------- | |
+--------------+
the two ethernet cards in machine "A" are 3com 3c905 PCI cards
(as is the card in "B" if that matters). both A and B are Pentiums'
running linux 2.0.33. the router is an ADSL "modem" and the hub is
from 3com.
A's kernel has ip_forwarding, firewall, ip_firewall, ip_masquerading, etc
compiled in. A can ping the router and out past it. it can also ping B
and other machines in the interior network. our ISP can ping both the
router and A, but can't ping B (which i expected since B has a private
address).
B can ping other machines in the interior network and A, but B _cannot_
ping the router or past it.
i have read the firewall/ip-masquerade/... HOWTOs, but cannot for the
life of me figure out what it is that i have to do to get packets from
B to the router successfully.
if anybody can help, please do. the alternative of having to go back
to using NT is too horrible to contemplate!
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