Connect two PC's

From: Stephan Wehner
Date: Wed Sep 14 2005 - 07:13:11 EST


Hi there,

I'm trying to connect two PC's with a network cable. A simple ping
doesn't work in either direction. One machine has two network cards.
So I can see that its routing table may need to be adjusted. But the
other machine has only one network card, and the cable goes straight
to the first machine. How can I find out what is wrong? Below is the
output of

ifconfig -a
route -n
ping <IP-address>

for both. The machines run livecd's (Knoppix 3.0 -- 2 network cards /
Puppy 1.0.4 -- one network card)

If I connect any of the three network cards to a router, I can reach
the Internet from both machines. So I don't think it is a hardware or
driver problem.

Would dmesg output help??

Stephan



Machine 1 has one network card, its IP address should be 192.168.2.115
# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:01:03:E7:8A:F8
inet addr:192.168.2.115 Bcast:192.168.2.255 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:1333 errors:0 dropped:0 overruns:0 carrier:1308
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 iB) TX bytes:202860 (198.1 kiB)
Interrupt:11 Base address:0xa000

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:1296 errors:0 dropped:0 overruns:0 frame:0
TX packets:1296 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:144848 (141.4 kiB) TX bytes:144848 (141.4 kiB)

# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.2.0 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
# ping 192.168.2.116
PING 192.168.2.116 (192.168.2.116): 56 data bytes

--- 192.168.2.116 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss


Machine 2 has two network cards. eth1 connects to the Internet (which "works")

# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:50:BA:48:29:7B
inet addr:192.168.2.116 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::250:baff:fe48:297b/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:1746 (1.7 KiB)
Interrupt:11 Base address:0xc000

eth1 Link encap:Ethernet HWaddr 00:D0:09:BF:5E:6D
inet addr:192.168.2.203 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::2d0:9ff:febf:5e6d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:448 errors:0 dropped:0 overruns:0 frame:0
TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:34232 (33.4 KiB) TX bytes:3164 (3.0 KiB)
Interrupt:10 Base address:0xe000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:724 (724.0 b) TX bytes:724 (724.0 b)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 192.168.2.1 0.0.0.0 UG 0 0 0 eth1
# ping 192.168.2.115
PING 192.168.2.115 (192.168.2.115): 56 data bytes

--- 192.168.2.115 ping statistics ---
27 packets transmitted, 0 packets received, 100% packet loss
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