开局新启的BFD对接不成功，ctrl类型，debug显示Session information not match. Discard packet.
根根据已有的信息判断，我司配置的BFD是单跳，发送的报文TTL是255.
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0000 44 a1 91 9c d1 8d 6c 87 20 8c 44 2c 08 00 45 e0
0010 00 34 c4 0a 00 00 ff 11 e1 77 0a 06 00 a6 0a 06
0020 00 a5 c3 ec 0e c8 00 20 00 00 20 48 03 18 00 00
0030 83 ed 00 00 00 00 00 0f 42 40 00 0f 42 40 00 00
0040 00 00
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而对端设备发送的报文，端口号是单跳3784，但是TTL是253，而非直连255。我司收到报文认为是多跳报文，和本地单跳会话不匹配。
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0000 6c 87 20 8c 44 2c 44 a1 91 9c d1 8d 81 00 0f ff
0010 08 00 45 e0 00 34 d7 b7 00 00 fd 11 cf ca 0a 06
0020 00 a5 0a 06 00 a6 e0 01 0e c8 00 20 00 00 20 40
0030 03 18 00 00 20 01 00 00 00 00 00 a0 37 a0 00 a0
0040 37 a0 00 00 00 00
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