On 09/30/2010 05:02 PM, John Doe wrote: > From: Mitja Mihelič<mitja.mihelic at arnes.si> >> I am trying to use hping to chek the latency of our network. >> Somehow things are not going to plan and I thought someone might be able >> to shed some light on the subject. >> Here is the setup: >> (the IP addresses gvien here are fake, but they do represent the correct >> state of the networking setup) >> vlan interface IP mask >> V2 eth0 192.168.20.20 32 >> V4 eth1 172.16.4.40 32 >> V6 eth2 172.16.6.60 32 >> >> The default route is set to eth1. >> The idea is to use eth2 for pinging only, the other two interfaces are >> used by another service and management access. > Could you show the ifconfig and route outputs...? > > JD The Centos version is 5.5. This is the kernel we are using (http://rpms.mcnc.org/web100/el5/distro-compat/i386/): 2.6.18-164.15.1.el5.web100PAE #1 SMP Mon May 17 17:01:51 EDT 2010 i686 athlon i386 GNU/Linux The IP addresses are presented as private addresses, netmasks are real. Here is the ifconfig output: [root at server ~]# ifconfig eth0 Link encap:Ethernet HWaddr 00:16:35:82:45:A0 inet addr:192.168.254.236 Bcast:192.168.254.239 Mask:255.255.255.240 inet6 addr: fe80::216:35ff:fe82:45a0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:139602 errors:0 dropped:0 overruns:0 frame:0 TX packets:58914 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:211203420 (201.4 MiB) TX bytes:4285647 (4.0 MiB) Interrupt:186 Memory:dc000000-dc012800 eth1 Link encap:Ethernet HWaddr 00:16:35:82:45:A2 inet addr:192.168.254.244 Bcast:192.168.254.247 Mask:255.255.255.248 inet6 addr: fe80::216:35ff:fe82:45a2/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15 errors:0 dropped:0 overruns:0 frame:0 TX packets:14 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1130 (1.1 KiB) TX bytes:1116 (1.0 KiB) Interrupt:194 Memory:da000000-da012800 eth2 Link encap:Ethernet HWaddr 00:15:17:C5:84:4D inet addr:192.168.254.18 Bcast:192.168.254.23 Mask:255.255.255.248 inet6 addr: fe80::215:17ff:fec5:844d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:29 errors:0 dropped:0 overruns:0 frame:0 TX packets:18 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2280 (2.2 KiB) TX bytes:1236 (1.2 KiB) Memory:dfde0000-dfe00000 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:21 errors:0 dropped:0 overruns:0 frame:0 TX packets:21 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4240 (4.1 KiB) TX bytes:4240 (4.1 KiB) And the route command output: [root at server ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.18.122 192.168.254.225 255.255.255.255 UGH 0 0 0 eth0 192.168.254.16 0.0.0.0 255.255.255.248 U 0 0 0 eth2 192.168.254.240 0.0.0.0 255.255.255.248 U 0 0 0 eth1 192.168.18.160 192.168.254.225 255.255.255.240 UG 0 0 0 eth0 192.168.254.224 0.0.0.0 255.255.255.240 U 0 0 0 eth0 192.168.1.64 192.168.254.225 255.255.255.192 UG 0 0 0 eth0 192.168.1.128 192.168.254.225 255.255.255.128 UG 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth2 0.0.0.0 192.168.254.241 0.0.0.0 UG 0 0 0 eth1 -- Mitja