1. eth1 problems - eth0:LAN:tulip eth1:DSL:3c509 w/ipmasq (static IP)
System:
Latest distribution (4.0 - kernel 2.2.6) of slackware. Freshly compiled
kernel with support for ipmasq and both ethernet cards (tulip:eth0 and
3c509:eth1).
Problem:
For security purposes I have substituted X.X.X.X for my static IP address
(on DSL) and Z.Z.Z.Z for my ISP's gateway machine throughout this document.
For some reason, eth1 and ipmasq functioning between eth0 and eth1 are not
working. Symptoms are described in the next few paragraphs.
From this machine or any machine on the LAN I can ping X.X.X.X but not
Z.Z.Z.Z
If I change the config files so the LAN is on eth1 and DSL is on eth0 I can
then ping Z.Z.Z.Z (also X.X.X.X & 192.168.150.1) from the linux box but I
cannot communicate with the rest of the LAN and the LAN cannot communicate
with the linux box. (I get full internet service on the linux box with this
configuration)
If I connect another computer directly to the DSL line, that machine can
reach the internet via DSL (again internet service is working correctly)
Relevant Config File Lines:
lilo.conf:
append = "ether=0,0,eth0 ether=0,0,eth1"
rc.inet1:
/sbin/ifconfig lo 127.0.0.1
/sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo
/sbin/ifconfig eth0 192.168.0.1 netmask 255.255.255.0 up
/sbin/ifconfig eth1 X.X.X.X netmask 255.255.255.0 up
/sbin/route add default gw Z.Z.Z.Z netmask 0.0.0.0 metric 1 dev eth1
rc.firewall:
echo "1"> /proc/sys/net/ipv4/ip_forward
/sbin/ipchains -P forward DENY
/sbin/ipchains -A forward -s 192.168.0.0/24 -j MASQ -i eth1
Relevent Output From Several Commands:
/sbin/route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
X.X.X.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 X.X.X.X 0.0.0.0 UG 1 0 0 eth1
/sbin/ifconfig
eth0 Link encap:Ethernet HWaddr ##:##:##:##:##:##
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth1 Link encap:Ethernet HWaddr ##:##:##:##:##:##
inet addr:X.X.X.X Bcast:Z.Z.Z.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
/sbin/ipchains --list -n
Chain input (policy ACCEPT):
Chain forward (policy DENY):
target prot opt source destination ports
MASQ all ------ 192.168.0.0/24 0.0.0.0/0 n/a
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