debug ip tcp
Display debugging information about the Transmission Control Protocol (TCP) transactions.
Modes
Privileged EXEC mode
Examples
device# debug ip tcp 2001:DB8::192:111:101:25 TCP: ipv6 address 2001:DB8::192:111:101:25 debugging is on Debug: Feb 11 10:46:57 TCP: sent packet (len=41) 2001:DB8::192:111:101:111:8197 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:18c2,seqn:11211247,ackn:835929143 Debug: Feb 11 10:46:57 TCP: sent packet (len=41) 2001:DB8::192:111:101:111:8197 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:1,hlen:5,chksum:14ac,seqn:11211268,ackn:835929143 Debug: Feb 11 10:46:57 TCP: rcvd packet (len=20) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8197 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:3bfa,seqn:835929143,ackn:11211268 Debug: Feb 11 10:46:57 TCP: rcvd packet (len=20) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8197 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:3bf9,seqn:835929143,ackn:11211290 Debug: Feb 11 10:46:57 TCP: rcvd packet (len=20) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8197 packet: syn:0,ack:1,rst:0,fin:1,hlen:5,chksum:3bce,seqn:835929143,ackn:11211290 Debug: Feb 11 10:46:57 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8197 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:1bce,seqn:11211290,ackn:835929144 Debug: Feb 11 10:47:05 TCP: sent packet (len=24) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:1,ack:0,rst:0,fin:0,hlen:6,chksum:26f,seqn:4002716695,ackn:0 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=24) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:1,ack:1,rst:0,fin:0,hlen:6,chksum:17a4,seqn:2607451983,ackn:4002716696 Debug: Feb 11 10:47:05 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:ef48,seqn:4002716696,ackn:2607451984 Debug: Feb 11 10:47:05 TCP: sent packet (len=75) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:17de,seqn:4002716696,ackn:2607451984 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=20) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:2f49,seqn:2607451984,ackn:4002716751 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=57) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:fc84,seqn:2607451984,ackn:4002716751 Debug: Feb 11 10:47:05 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:ef11,seqn:4002716751,ackn:2607452021 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=39) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:2af6,seqn:2607452021,ackn:4002716751 Debug: Feb 11 10:47:05 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:ef11,seqn:4002716751,ackn:2607452040 Debug: Feb 11 10:47:05 TCP: sent packet (len=39) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:eabe,seqn:4002716751,ackn:2607452040 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=20) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:2f11,seqn:2607452040,ackn:4002716770 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=108) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:aa71,seqn:2607452040,ackn:4002716770 Debug: Feb 11 10:47:05 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:eec6,seqn:4002716770,ackn:2607452128 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=39) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:2a8b,seqn:2607452128,ackn:4002716770 Debug: Feb 11 10:47:05 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:eec6,seqn:4002716770,ackn:2607452147 Debug: Feb 11 10:47:05 TCP: rcvd packet (len=108) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:80c6,seqn:2607452147,ackn:4002716770 Debug: Feb 11 10:47:05 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:179 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:eec6,seqn:4002716770,ackn:2607452235 Debug: Feb 11 10:47:06 TCP: rcvd packet (len=108) 2001:DB8::192:111:101:25:179 -> 2001:DB8::192:111:101:111:8178 packet: syn:0,ack:1,rst:0,fin:0,hlen:5,chksum:cd4a,seqn:2607452235,ackn:4002716770 Debug: Feb 11 10:47:06 TCP: sent packet (len=20) 2001:DB8::192:111:101:111:8178 -> 2001:DB8::192:111:101:25:17