i have got Cisco 1751 router, S0/0 has got 1 public IP & fasethernet 0/0 also got 1 public IP, all the users on the LAN are accesing internet via a LINUX gateway machine. now the problem is, i am able to ping 192.168.87.1 from my LAN as well as from the router console, but all my LAN network is 192.168.100.0/24. even after removing the fastethernet 0/0 cable, still i could able to ping 192.168.87.1 which is going towards the ISP. now to avoid this how do i put the access-list on my router? because of this, when LAN users try to ping the gateway machine(192.168.100.1)time response it is getting time=500ms, when i disable s0/0 time=<14ms.
fastethernet connected to a gateway PC have 2 NIC, 1 Public IP & other private IP(192.168.100.0/24), now when i removed the fastethernet cable on the router, i could able to ping 192.168.87.1 which is pointing towards my ISP. so how do i restrict by putting access-list in my router for that particular network(192.168.87.0/24)?
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