使ってみよう(2)

AHのパケットのつくり(tcpdumpに-xオプションをつける)

64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.241 ms
14:54:59.705694 IP 127.0.0.1 > 127.0.0.1: AH(spi=0x00002000,seq=0x395): icmp 64: echo request seq 1
        0x0000:  4500 006c c938 0000 4033 0000 7f00 0001  E..l.8..@3......
        0x0010:  7f00 0001 0104 0000 0000 2000 0000 0395  ................
        0x0020:  4c76 2868 8611 f5e1 618d 6862 0800 b9fa  Lv(h....a.hb....
        0x0030:  534a 0001 45d3 f5b3 000a c425 0809 0a0b  SJ..E......%....
        0x0040:  0c0d 0e0f 1011 1213 1415 1617 1819 1a1b  ................
        0x0050:  1c1d 1e1f 2021 2223 2425 2627 2829 2a2b  .....!"#$%&'()*+
        0x0060:  2c2d 2e2f 3031 3233 3435 3637            ,-./01234567
14:54:59.705787 IP 127.0.0.1 > 127.0.0.1: AH(spi=0x00002000,seq=0x397): icmp 64: echo reply seq 1
        0x0000:  4500 006c c939 0000 4033 0000 7f00 0001  E..l.9..@3......
        0x0010:  7f00 0001 0104 0000 0000 2000 0000 0397  ................
        0x0020:  a2e7 1a9f 898c 2084 0ab3 0d8a 0000 c1fa  ................
        0x0030:  534a 0001 45d3 f5b3 000a c425 0809 0a0b  SJ..E......%....
        0x0040:  0c0d 0e0f 1011 1213 1415 1617 1819 1a1b  ................
        0x0050:  1c1d 1e1f 2021 2223 2425 2627 2829 2a2b  .....!"#$%&'()*+
        0x0060:  2c2d 2e2f 3031 3233 3435 3637            ,-./01234567