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A router (IPv4) Destination Interface 0.0.0.0/0 m0 172.58.128.0/17 m1 172.58.128.0/19 m2 172.58.160.0/19 m3 I need choose which interface is correct. I did so: 172.58.218.80 m2 172.58.165.90 m3 172.58.124.36 m1 172.58.169.18 m3 172.58.155.112 m2 172.59.12.142 m0 Can anyone check if I did this right? Beacuse I do not really understand the "longest prefix match". How can I know the address is been "match" in the routing table? Thanks Thanks. resmon6 So Step1 convert it to binary. 10101100.00111010.10000000.00000000 172.58.128.0/17 10101100.00111010.10000000.00000000 172.58.128.0/19 10101100.00111010.10100000.00000000 172.58.160.0/19 Step2 use subnet mask to get the prefix. 10101100.00111010.1 is the prefix for 172.58.128.0/17 10101100.00111010.100 is the prefix for 172.58.128.0/19 10101100.00111010.101 is the prefix for 172.58.160.0/19 Step3 10101100.00111010.11011010.01010000 172.58.218.80 10101100.00111010.10100101.01011010 172.58.165.90 10101100.00111010.01111100.00100100 172.58.124.36 10101100.00111010.10101001.00010010 172.58.169.18 10101100.00111010.10011011.01110000 172.58.155.112 10101100.00111011.00001100.10001110 172.59.12.142 -------------------------------------------------------- 10101100.00111010.1 10101100.00111010.100 10101100.00111010.101 So it means 172.58.218.80 m1 172.58.165.90 m3 172.58.124.36 m0 172.58.169.18 m3 172.58.155.112 m2 172.59.12.142 m0 Can you help me to check it is correct now ? Thanks

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