Firstly, don’t think that PING is 100% reliable, it is a very useful tool, but the packets can be failing for a number of reasons, and can be filtered or dropped because a device is too busy, or a number of other reasons.
However, if the test works fine from your laptop, but not through the router, then the router config is a very likely candidate as the cause of the problem.
Have you tried the PING test from the router itself ? Did this also drop the packets ?
If that works, then it is the router config that is probably at fault, if that also fails, then it may be a routing issue, or a problem between the router and the modem. If that is Ethernet, have you fixed the speed and duplex ? Try setting it to auto, reset the link, and try again.
If none of the above helps, then can you post a copy of the config here ? It is difficult to diagnose when we cannot see the config ! (or even know what model of router it is).
Tks for u r valuable responds
Router : Dax DX-1821
I tried the PING test from the router itself, I got replay with out request timed out.
Please check running config..
! No configuration change since last restart
!software version 6.0.52(integrity)
!software image file flash0: /flash/rpl-i-6.0.52.bin
!compiled on Jul 16 2007, 18:42:18
no service password-encrypt
no service new-encrypt
enable password RYTXUSXXXPX encrypt
ip name-server 188.8.131.52
ip name-server 184.108.40.206
ip address 220.127.116.11 255.255.255.252
ip address 18.104.22.168 255.255.255.240
ip address 172.24.65.121 255.255.255.252
no ip route-cache
no ndsp enable
no mpls route-cache
ip route 0.0.0.0 0.0.0.0 22.214.171.124
ip route 0.0.0.0 0.0.0.0 126.96.36.199
line vty 0 4
password 0 sevenindia