mcclnx mcc
2007-Aug-29 13:41 UTC
[CentOS] need help on second Ethernet port (eth1) point to point connect
I have two DELL servers with two Ethernet ports in it.
Bith servers have CENTOS 4.5 installed. First
Ethernet port connect to public Ethernet line and work
correctly. Second Ethernet port I connect
point-to-point as private Ethernet (cable direct
connect without router or switch). Private Ethernet
use IP asddress 1.1.1.1 and 1.1.1.2.
I check "ifconfig -a" and both eth0 and eth1 are up
and active. when I tried to ping another server use
second port (private) and no response. Does anything
I configure wrong?
Thanks.
======== info ===
%ifconfig -a
eth0 Link encap:Ethernet HWaddr
00:08:74:EA:54:64
inet addr:172.29.86.15 Bcast:172.29.85.255
Mask:255.255.255.0
inet6 addr: fe80::208:74ff:feea:5464/64
Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX packets:471 errors:0 dropped:0 overruns:0
frame:0
TX packets:91 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:0
RX bytes:65669 (64.1 KiB) TX bytes:11847
(11.5 KiB)
eth1 Link encap:Ethernet HWaddr
00:0E:2E:C8:B9:80
inet addr:1.1.1.1 Bcast:1.1.1.255
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:0 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:18 Base address:0x4c00
%ping 1.1.1.2
PING 1.1.1.2 (1.1.1.2) 56(84) bytes of data.>From 1.1.1.1 icmp_seq=1 Destination Host Unreachable
>From 1.1.1.1 icmp_seq=2 Destination Host Unreachable
>From 1.1.1.1 icmp_seq=3 Destination Host Unreachable
--- 1.1.1.2 ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100%
packet loss, time 3015ms
, pipe 3
%telnet 1.1.1.2
Trying 1.1.1.2...
telnet: connect to address 1.1.1.2: No route to host
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gnulinux
2007-Aug-29 14:09 UTC
[CentOS] need help on second Ethernet port (eth1) point to point connect
mcclnx mcc wrote:> I have two DELL servers with two Ethernet ports in it. > Bith servers have CENTOS 4.5 installed. First > Ethernet port connect to public Ethernet line and work > correctly. Second Ethernet port I connect > point-to-point as private Ethernet (cable direct > connect without router or switch). Private Ethernet > use IP asddress 1.1.1.1 and 1.1.1.2. > > I check "ifconfig -a" and both eth0 and eth1 are up > and active. when I tried to ping another server use > second port (private) and no response. Does anything > I configure wrong? > > Thanks. > > ======== info === > > %ifconfig -a > eth0 Link encap:Ethernet HWaddr > 00:08:74:EA:54:64 > inet addr:172.29.86.15 Bcast:172.29.85.255 > Mask:255.255.255.0 > inet6 addr: fe80::208:74ff:feea:5464/64 > Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 > Metric:1 > RX packets:471 errors:0 dropped:0 overruns:0 > frame:0 > TX packets:91 errors:0 dropped:0 overruns:0 > carrier:0 > collisions:0 txqueuelen:0 > RX bytes:65669 (64.1 KiB) TX bytes:11847 > (11.5 KiB) > > eth1 Link encap:Ethernet HWaddr > 00:0E:2E:C8:B9:80 > inet addr:1.1.1.1 Bcast:1.1.1.255 > 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:0 errors:0 dropped:0 overruns:0 > carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) > Interrupt:18 Base address:0x4c00 > > %ping 1.1.1.2 > PING 1.1.1.2 (1.1.1.2) 56(84) bytes of data. > >From 1.1.1.1 icmp_seq=1 Destination Host Unreachable > >From 1.1.1.1 icmp_seq=2 Destination Host Unreachable > >From 1.1.1.1 icmp_seq=3 Destination Host Unreachable > > --- 1.1.1.2 ping statistics --- > 4 packets transmitted, 0 received, +3 errors, 100% > packet loss, time 3015ms > , pipe 3 > > > %telnet 1.1.1.2 > Trying 1.1.1.2... > telnet: connect to address 1.1.1.2: No route to host >Try a private network IP 192.168.xxx.xxx? Right ether cable, straight?
John R Pierce
2007-Aug-29 14:38 UTC
[CentOS] need help on second Ethernet port (eth1) point to point connect
mcclnx mcc wrote:> I have two DELL servers with two Ethernet ports in it. > Bith servers have CENTOS 4.5 installed. First > Ethernet port connect to public Ethernet line and work > correctly. Second Ethernet port I connect > point-to-point as private Ethernet (cable direct > connect without router or switch). Private Ethernet > use IP asddress 1.1.1.1 and 1.1.1.2. >are you using a 'crossover' cable for this? you can't patch two NIC' directly together with a regular patch cable, it has to be a crossover cable that has Tx wired to Rx and visa versa. Also, I've had mixed results using crossover cabling with 1000baseT gig ethernet
Robert Moskowitz
2007-Aug-29 15:49 UTC
[CentOS] need help on second Ethernet port (eth1) point to point connect
mcclnx mcc wrote:> I have two DELL servers with two Ethernet ports in it. > Bith servers have CENTOS 4.5 installed. First > Ethernet port connect to public Ethernet line and work > correctly. Second Ethernet port I connect > point-to-point as private Ethernet (cable direct > connect without router or switch). Private Ethernet > use IP asddress 1.1.1.1 and 1.1.1.2. >Take a quick look at RFC 1918 for priviate addresses to use (I am a co-author of that RFC). Advice: If you use addresses from the 192.168 range, avoid the nets: 192.168.0.0, 192.168.1.0, 192.168.2.0, and 192.168.100.0 These are commonly used by various 'appliances'. Choose something 'wierd' like 192.168.49.0 (or some other prime number less than 255). Though I tend to use 192.168.64.0, 192.168.96.0, or 192.168.128.0 Also avoid the 172.16 and 10. ranges. These are commonly used in Company internal private networks, and if you want to 'VPN' to them, it can cause unwanted results (like it won't work). This is general advice to anyone using private addresses for small usages (from a person that has taken more flak on private addresses and NAT than you probably care to deal with; I 'caused it').> I check "ifconfig -a" and both eth0 and eth1 are up > and active. when I tried to ping another server use > second port (private) and no response. Does anything > I configure wrong? > > Thanks. > > ======== info === > > %ifconfig -a > eth0 Link encap:Ethernet HWaddr > 00:08:74:EA:54:64 > inet addr:172.29.86.15 Bcast:172.29.85.255 > Mask:255.255.255.0 > inet6 addr: fe80::208:74ff:feea:5464/64 > Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 > Metric:1 > RX packets:471 errors:0 dropped:0 overruns:0 > frame:0 > TX packets:91 errors:0 dropped:0 overruns:0 > carrier:0 > collisions:0 txqueuelen:0 > RX bytes:65669 (64.1 KiB) TX bytes:11847 > (11.5 KiB) > > eth1 Link encap:Ethernet HWaddr > 00:0E:2E:C8:B9:80 > inet addr:1.1.1.1 Bcast:1.1.1.255 > 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:0 errors:0 dropped:0 overruns:0 > carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) > Interrupt:18 Base address:0x4c00 > > %ping 1.1.1.2 > PING 1.1.1.2 (1.1.1.2) 56(84) bytes of data. > >From 1.1.1.1 icmp_seq=1 Destination Host Unreachable > >From 1.1.1.1 icmp_seq=2 Destination Host Unreachable > >From 1.1.1.1 icmp_seq=3 Destination Host Unreachable > > --- 1.1.1.2 ping statistics --- > 4 packets transmitted, 0 received, +3 errors, 100% > packet loss, time 3015ms > , pipe 3 > > > %telnet 1.1.1.2 > Trying 1.1.1.2... > telnet: connect to address 1.1.1.2: No route to host > > > ____________________________________________________________________________________ > ????????????? - ???? Yahoo!??????http://tw.info.yahoo.com/seal/index.html > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > >
Robert Moskowitz
2007-Aug-29 15:53 UTC
[CentOS] need help on second Ethernet port (eth1) point to point connect
John R Pierce wrote:> mcclnx mcc wrote: > >> I have two DELL servers with two Ethernet ports in it. >> Bith servers have CENTOS 4.5 installed. First >> Ethernet port connect to public Ethernet line and work >> correctly. Second Ethernet port I connect >> point-to-point as private Ethernet (cable direct >> connect without router or switch). Private Ethernet >> use IP asddress 1.1.1.1 and 1.1.1.2. >> >> > > > are you using a 'crossover' cable for this? you can't patch two NIC' > directly together with a regular patch cable, it has to be a crossover > cable that has Tx wired to Rx and visa versa. Also, I've had mixed > results using crossover cabling with 1000baseT gig ethernetA large number of NICs are autosensing. They do not need a crossover cable. I can hook any of my three notebooks together point to point with a regular cable. They figure it out. Many of my switches do not have the MTI/MTO switch; they autosense if they are 'down stream'. I forget which standard. For some reason I am thinking IEEE 802.1ab, but it is probably a different one.>