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
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