Hi,

I'm trying to share internet with following two machines.


Machine1 - "Main"
- AthlonXP 1800+, 1G RAM
- OS: Fedora Core 1 (kernel-2.4.22-1.2174.nptl, installed with rpm)
- eth0: 61.96.30.10
- eth1: 192.168.0.1

Machine2 - "Sub"
- Samsung SQ20(Laptop)
- OS: Fedora Core 1 (kernel-2.4.22-1.2174.nptl, installed with rpm)
- eth0: 192.168.0.2


But when I ping with two NICs, it fails. I don't know what is wrong with my configurations.
Here are results of some network commands:




+++ On the Main Machine +++

# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:40:F4:21:26:22
inet addr:61.96.30.10 Bcast:255.255.255.255 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10170 errors:0 dropped:0 overruns:0 frame:0
TX packets:471 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:623110 (608.5 Kb) TX bytes:33998 (33.2 Kb)
Interrupt:10 Base address:0x1000

eth1 Link encap:Ethernet HWaddr 00:C0:26:2E:66:58
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:493 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:29884 (29.1 Kb)
Interrupt:11 Base address:0x3000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3852 errors:0 dropped:0 overruns:0 frame:0
TX packets:3852 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:188919 (184.4 Kb) TX bytes:188919 (184.4 Kb)


# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
61.96.30.0 0.0.0.0 255.255.255.128 U 0 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 61.96.30.1 0.0.0.0 UG 0 0 0 eth0



# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination


# ping -c 4 211.218.150.200 # other network
PING 211.218.150.200 (211.218.150.200) 56(84) bytes of data.
64 bytes from 211.218.150.200: icmp_seq=0 ttl=54 time=16.8 ms
64 bytes from 211.218.150.200: icmp_seq=1 ttl=54 time=14.3 ms
64 bytes from 211.218.150.200: icmp_seq=2 ttl=54 time=18.6 ms
64 bytes from 211.218.150.200: icmp_seq=3 ttl=54 time=33.8 ms

--- 211.218.150.200 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3029ms
rtt min/avg/max/mdev = 14.340/20.919/33.859/7.624 ms, pipe 2


# ping -c 4 192.168.0.2
PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
From 192.168.0.1 icmp_seq=0 Destination Host Unreachable
From 192.168.0.1 icmp_seq=1 Destination Host Unreachable
From 192.168.0.1 icmp_seq=2 Destination Host Unreachable
From 192.168.0.1 icmp_seq=3 Destination Host Unreachable

--- 192.168.0.2 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3020ms
, pipe 4


# ping -c 4 -I 61.96.30.10 192.168.0.1
PING 192.168.0.1 (192.168.0.1) from 61.96.30.10 : 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=0 ttl=64 time=0.077 ms
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=0.018 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.015 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.017 ms

--- 192.168.0.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3016ms
rtt min/avg/max/mdev = 0.015/0.031/0.077/0.027 ms, pipe 2



# ping -c 4 -I 192.168.0.1 61.96.30.10
PING 61.96.30.10 (61.96.30.10) from 192.168.0.1 : 56(84) bytes of data.
64 bytes from 61.96.30.10: icmp_seq=0 ttl=64 time=0.095 ms
64 bytes from 61.96.30.10: icmp_seq=1 ttl=64 time=0.015 ms
64 bytes from 61.96.30.10: icmp_seq=2 ttl=64 time=0.013 ms
64 bytes from 61.96.30.10: icmp_seq=3 ttl=64 time=0.015 ms

--- 61.96.30.10 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3010ms
rtt min/avg/max/mdev = 0.013/0.034/0.095/0.035 ms, pipe 2




+++ On the Sub Machine +++

# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:00:F0:70:F2:29
inet addr:192.168.0.2 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:15543 errors:0 dropped:0 overruns:0 frame:0
TX packets:1834 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1928859 (1.8 Mb) TX bytes:272228 (265.8 Kb)
Interrupt:11 Base address:0x3000 Memory:e0201000-e0201038

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:288 errors:0 dropped:0 overruns:0 frame:0
TX packets:288 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:31119 (30.3 Kb) TX bytes:31119 (30.3 Kb)



# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0


# ping -c 4 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
From 192.168.0.2 icmp_seq=0 Destination Host Unreachable
From 192.168.0.2 icmp_seq=1 Destination Host Unreachable
From 192.168.0.2 icmp_seq=2 Destination Host Unreachable
From 192.168.0.2 icmp_seq=3 Destination Host Unreachable

--- 192.168.0.1 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3025ms
, pipe 3




thanks.

stupid question: are you sure of you network wire??? cause everything seem to be well configured

I've tested with three NICs and Three wires. (testing on other machine they're all OK)
But everytime I tried, it fails.

Is the firewall on computer#2 blocking things? Computer #1 is connected to the net and the iptables should be setup on that one, not the second machine.

+++ On The Sub Machine(192.168.0.2) +++

# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination


.. I still don't know what's wrong.

If the two computers are connected directly using a cat5 cable from machine #1 to machine #2 , then you will need to use a crossover cable . If you are going through a hub/switch , then you would use a regular cat5 cable.

I didn't know that there're two kinds of cable.
Thanks a lot, homey. I've tried that work only with direct cables.

I think I need a crossover cable.

thanks.

The rule is simple: crossover wire to link same type of machine (PC-PC or hub-hub) and direct one to link different type (pc-hub)