IP XFRM配置示例：利用linux kernel自带的IPSec实现，手动配置IPSec
1、拓扑192.168.18.101192.168.18.1022、配置192.168.18.101ip xfrm state add src 192.168.18.101 dst 192.168.18.102 proto esp spi 0x00000301 mode tunnel auth md5 0x96358c90783bbfa3d7b196ceabe0536b enc
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1、拓扑
192.168.18.101 <=======> 192.168.18.102
2、配置192.168.18.101
ip xfrm state add src 192.168.18.101 dst 192.168.18.102 proto esp spi 0x00000301 mode tunnel auth md5 0x96358c90783bbfa3d7b196ceabe0536b enc des3_ede 0xf6ddb555acfd9d77b03ea3843f2653255afe8eb5573965df
ip xfrm state add src 192.168.18.102 dst 192.168.18.101 proto esp spi 0x00000302 mode tunnel auth md5 0x99358c90783bbfa3d7b196ceabe0536b enc des3_ede 0xffddb555acfd9d77b03ea3843f2653255afe8eb5573965df
ip xfrm state get src 192.168.18.101 dst 192.168.18.102 proto esp spi 0x00000301
ip xfrm policy add src 192.168.18.101 dst 192.168.18.102 dir out ptype main tmpl src 192.168.18.101 dst 192.168.18.102 proto esp mode tunnel
ip xfrm policy add src 192.168.18.102 dst 192.168.18.101 dir in ptype main tmpl src 192.168.18.102 dst 192.168.18.101 proto esp mode tunnel
ip xfrm policy ls3、配置192.168.18.102
ip xfrm state add src 192.168.18.101 dst 192.168.18.102 proto esp spi 0x00000301 mode tunnel auth md5 0x96358c90783bbfa3d7b196ceabe0536b enc des3_ede 0xf6ddb555acfd9d77b03ea3843f2653255afe8eb5573965df
ip xfrm state add src 192.168.18.102 dst 192.168.18.101 proto esp spi 0x00000302 mode tunnel auth md5 0x99358c90783bbfa3d7b196ceabe0536b enc des3_ede 0xffddb555acfd9d77b03ea3843f2653255afe8eb5573965df
ip xfrm state get src 192.168.18.101 dst 192.168.18.102 proto esp spi 0x00000301
ip xfrm policy add src 192.168.18.101 dst 192.168.18.102 dir in ptype main tmpl src 192.168.18.101 dst 192.168.18.102 proto esp mode tunnel
ip xfrm policy add src 192.168.18.102 dst 192.168.18.101 dir out ptype main tmpl src 192.168.18.102 dst 192.168.18.101 proto esp mode tunnel
ip xfrm policy ls
ping 192.168.18.1024.2在192.168.18.102上抓包
tcpdump -p esp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
11:12:00.771364 IP 192.168.18.101 > 192.168.18.102: ESP(spi=0x00000301,seq=0x41d), length 116
11:12:00.771498 IP 192.168.18.102 > 192.168.18.101: ESP(spi=0x00000302,seq=0x183), length 116
11:12:01.773378 IP 192.168.18.101 > 192.168.18.102: ESP(spi=0x00000301,seq=0x41e), length 116
11:12:01.773787 IP 192.168.18.102 > 192.168.18.101: ESP(spi=0x00000302,seq=0x184), length 116
11:12:02.774682 IP 192.168.18.101 > 192.168.18.102: ESP(spi=0x00000301,seq=0x41f), length 116
11:12:02.774793 IP 192.168.18.102 > 192.168.18.101: ESP(spi=0x00000302,seq=0x185), length 116
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