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I have a Linux box which is connected to one machine (say boxer). eth0 of linux box is directly connected to boxer. I have vlan range 500-550.

Below is ifconfig details of linux, all o/g and i/c communication is made thru eth0. I have used eth3 interface and have configured vlan 504 on it and have assigned ip 10.105.91.211. on boxer also there is one ip configured on vlan 504 and ip 10.105.91.208. but still i am unable to ping this IP. what could be the issue. if i assign ip of range other than 10.105.91.x it starts pinging

eth0      Link encap:Ethernet  HWaddr 00:0C:29:DE:95:58
          inet addr:10.105.91.209  Bcast:10.105.91.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fede:9558/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:95485785 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10019 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:5743048967 (5.3 GiB)  TX bytes:674089 (658.2 KiB)

eth2      Link encap:Ethernet  HWaddr 00:0C:29:DE:95:6C
          inet addr:10.10.50.1  Bcast:10.10.50.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fede:956c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2646 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2650 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:149031 (145.5 KiB)  TX bytes:113370 (110.7 KiB)

eth3.504  Link encap:Ethernet  HWaddr 00:0C:29:DE:95:76
          inet addr:10.105.91.212  Bcast:10.105.91.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fede:9576/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:93510 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2505 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:30000
          RX bytes:5236737 (4.9 MiB)  TX bytes:106154 (103.6 KiB)

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:631 errors:0 dropped:0 overruns:0 frame:0
          TX packets:631 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:47276 (46.1 KiB)  TX bytes:47276 (46.1 KiB)

pnqa-ares-callgen:~# ping 10.105.91.208
PING 10.105.91.208 (10.105.91.208) 56(84) bytes of data.
From 10.105.91.209 icmp_seq=2 Destination Host Unreachable
From 10.105.91.209 icmp_seq=3 Destination Host Unreachable
From 10.105.91.209 icmp_seq=4 Destination Host Unreachable
From 10.105.91.209 icmp_seq=6 Destination Host Unreachable
From 10.105.91.209 icmp_seq=7 Destination Host Unreachable

pnqa-ares-callgen:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.10.50.0      0.0.0.0         255.255.255.0   U     0      0        0 eth2
10.105.91.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.105.91.0     0.0.0.0         255.255.255.0   U     0      0        0 eth3
0.0.0.0         10.105.91.1     0.0.0.0         UG    0      0        0 eth0

Basically here vlan ip is of same range as that of management ip..

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Your post is very hard to read, try using the formatting options for code ( {} button in the editor ). –  sgtbeano Dec 4 '13 at 12:42

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