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Old 02-23-2004, 08:39 AM   #1
sandrain
LQ Newbie
 
Registered: Feb 2004
Distribution: fedora
Posts: 5

Rep: Reputation: 0
Unhappy Sharing Internet with two machines, ping doen't work


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.

Last edited by sandrain; 02-23-2004 at 08:40 AM.
 
Old 02-23-2004, 11:28 AM   #2
Oliv'
Senior Member
 
Registered: Jan 2004
Location: Montpellier (France)
Distribution: Gentoo
Posts: 1,014

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stupid question: are you sure of you network wire??? cause everything seem to be well configured
 
Old 02-23-2004, 08:04 PM   #3
sandrain
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Registered: Feb 2004
Distribution: fedora
Posts: 5

Original Poster
Rep: Reputation: 0
I've tested with three NICs and Three wires. (testing on other machine they're all OK)
But everytime I tried, it fails.
 
Old 02-23-2004, 08:53 PM   #4
homey
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Registered: Oct 2003
Posts: 3,057

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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.
 
Old 02-24-2004, 09:05 AM   #5
sandrain
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Registered: Feb 2004
Distribution: fedora
Posts: 5

Original Poster
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setting of the second one

+++ 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.
 
Old 02-24-2004, 09:40 AM   #6
homey
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Registered: Oct 2003
Posts: 3,057

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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.
 
Old 02-24-2004, 11:39 AM   #7
sandrain
LQ Newbie
 
Registered: Feb 2004
Distribution: fedora
Posts: 5

Original Poster
Rep: Reputation: 0
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.

Last edited by sandrain; 02-24-2004 at 11:40 AM.
 
Old 02-24-2004, 12:59 PM   #8
Oliv'
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Registered: Jan 2004
Location: Montpellier (France)
Distribution: Gentoo
Posts: 1,014

Rep: Reputation: 36
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)
 
  


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