I am having some weird problems with the network connection on my server which is running RHEL5. Please note that my eth0 is configured with two IP addresses(192.168.2.43,192.186.3.3).

It seems that it requires some time to respond to the every first request in every connection. For example, whenever I ping the machine from another machine(192.168.3.2,same subnet/LAN), the first ping response time would be much longer.

PING 192.168.3.3 (192.168.3.3) 56(84) bytes of data.
64 bytes from 192.168.3.3: icmp_seq=1 ttl=64 time=1.45 ms
64 bytes from 192.168.3.3: icmp_seq=2 ttl=64 time=0.150 ms
64 bytes from 192.168.3.3: icmp_seq=3 ttl=64 time=0.153 ms
64 bytes from 192.168.3.3: icmp_seq=4 ttl=64 time=0.148 ms

The problem happens with other applications(FTP,MySQL,SSH) I have tried too. For example, it requires more than 10 seconds to authenticate the login.
[13:32:15] Connecting to 192.168.3.2 -> IP=192.168.3.3 PORT=21
[13:32:15] Connected to 192.168.3.3
[13:32:15] 220 (vsFTPd 2.0.5)
[13:32:15] USER XXXXX
[13:32:15] 331 Please specify the password.
[13:32:15] PASS (hidden)
[13:32:24] 230 Login successful.

If I remove the default route/gateway, everything works flawlessly. When I ran 'route', the first three routes are displayed immediately and the last row(default gw) only comes out after around 10 seconds.

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 * 255.255.255.0 U 0 0 0 eth0
192.168.2.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 192.168.3.1 0.0.0.0 UG 0 0 0 eth0

The below is my ifconfig result:-
eth0
Link encap:Ethernet HWaddr 00:19:B9:F8:07:4B
inet addr:192.168.2.43 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::219:b9ff:fef8:74b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9064 errors:0 dropped:0 overruns:0 frame:0
TX packets:7814 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2128237 (2.0 MiB) TX bytes:1362499 (1.2 MiB)
Interrupt:169

eth0:110
Link encap:Ethernet HWaddr 00:19:B9:F8:07:4B
inet addr:192.168.3.3 Bcast:192.168.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:169

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:151023 errors:0 dropped:0 overruns:0 frame:0
TX packets:151023 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:39238823 (37.4 MiB) TX bytes:39238823 (37.4 MiB)


Can anyone help me? I highly suspect this has something with the ARP issue...Thanks.

Guys, just FYI, I solved it by removing everything in /etc/resolv.conf.