RE: Connect two PC's

From: Charlie Liu
Date: Wed Sep 14 2005 - 11:35:21 EST


Or, connect two PCs to an network Hub or a Bridge for HW connection.

Charlie X. Liu

Sensoray Company, Inc. (http://www.sensoray.com)
7313 SW Tech Center Dr.
Tigard, OR 97223


-----Original Message-----
From: linux-net-owner@xxxxxxxxxxxxxxx
[mailto:linux-net-owner@xxxxxxxxxxxxxxx]On Behalf Of Guy
Sent: Wednesday, September 14, 2005 5:59 AM
To: stephanwehner@xxxxxxxxx; linux-net@xxxxxxxxxxxxxxx
Subject: RE: Connect two PC's


Normally you need a special cable to connect 2 computers directly. The
cable is called a cross-over cable. Some NICs don't require cross-over
cables.

> -----Original Message-----
> From: linux-net-owner@xxxxxxxxxxxxxxx [mailto:linux-net-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Stephan Wehner
> Sent: Wednesday, September 14, 2005 8:13 AM
> To: linux-net@xxxxxxxxxxxxxxx
> Subject: Connect two PC's
>
> 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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