The old bigip device is using a default route, reachable through the self ip 123.123.123.123
[root@lb2:Active] config tcpdump -nni 0.0:nnn -s0 host 1.1.1.1 or host 2.2.2.2 and port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0:nnn, link-type EN10MB (Ethernet), capture size 65535 bytes
17:51:22.351698 IP 123.123.123.123.55841 > 2.2.2.2.80: S 3039961864:3039961864(0) win 5840 out slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.364182 IP 2.2.2.2.80 > 123.123.123.123.55841: S 1491322061:1491322061(0) ack 3039961865 win 5792 in slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=512 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.364714 IP 123.123.123.123.55841 > 2.2.2.2.80: . ack 1 win 46 out slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.369011 IP 123.123.123.123.55841 > 2.2.2.2.80: P 1:156(155) ack 1 win 46 out slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.381035 IP 2.2.2.2.80 > 123.123.123.123.55841: . ack 156 win 429 in slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=512 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.381317 IP 2.2.2.2.80 > 123.123.123.123.55841: P 1:284(283) ack 156 win 429 in slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=512 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.381771 IP 123.123.123.123.55841 > 2.2.2.2.80: . ack 284 win 54 out slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.385329 IP 123.123.123.123.55841 > 2.2.2.2.80: F 156:156(0) ack 284 win 54 out slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.397684 IP 2.2.2.2.80 > 123.123.123.123.55841: F 284:284(0) ack 157 win 429 in slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=512 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094
17:51:22.397817 IP 123.123.123.123.55841 > 2.2.2.2.80: . ack 285 win 54 out slot1/tmm1 lis= flowtype=130 flowid=D10F1C0 peerid=1A3A6E40 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:D4121204 peerlocal=00000000:00000000:0000FFFF:BCAEB90A remoteport=55841 localport=80 proto=0 vlan=4094