Isn't IP Forwarding the default?
Folks,
I am replacing a CISCO router with a Linux box running 2.0.34. I have
an Emerging Technologies Card, which connects to the V.35 "modem" my ISP
gave. The machine refuses to forward packets accross interfaces.
My configuration:
Linux earth 2.0.34 #19 Sun Oct 17 17:03:59 IST 1999 i586 unknown
eth0 Local (192.168.x.y) card
eth1 "valid" IP card (12.10.198.112/29) card, for mail servers, etc
ets0 Card to talk to RF Modem, runs PPP
[ghane@earth:~> netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
12.10.199.61 0.0.0.0 255.255.255.255 UH 1500 0 0 ets0
12.10.198.112 0.0.0.0 255.255.255.248 U 1500 0 0 eth1
192.168.200.0 0.0.0.0 255.255.255.0 U 1500 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 3584 0 0 lo
0.0.0.0 12.10.199.61 0.0.0.0 UG 1500 0 0 ets0
# /sbin/ipfwadm -F -e -p accept
# echo "1" > /proc/sys/net/ipv4/ip_forward
IP Masq works beautifully.
[ghane@earth:~> /sbin/ipfwadm -l -v -F
IP firewall forward rules, default policy: accept
type prot source destination ports
acc/m all arjun.eurolink.stpn.soft.net anywhere n/a
acc/m all nakul.eurolink.stpn.soft.net anywhere n/a
acc/m all pc-16.eurolink.stpn.soft.net anywhere n/a
acc/m all 12.10.198.116 anywhere n/a
I know I should not have an open router, but that is secondary. How can I
tell the box to forward, simply, blindly? I will start firewalling later.
Thanks,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sanjeev "Ghane" Gupta Tel: +91(11) 6941831, 6946619
Eurolink Systems Ltd Fax: +91(11) 6943732
New Delhi, India email: ghane@eurolink.stpn.soft.net
Eurolink doesn't pay me to speak for it, so I don't
Old age is not an accomplishment, nor youth a sin
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