[root@lb2:Active] config curl -v -I http://1.1.1.1 -H "Host: test.abc.com"
* About to connect() to 1.1.1.1 port 80
* Trying 1.1.1.1... connected
* Connected to 1.1.1.1 (1.1.1.1) port 80
> HEAD / HTTP/1.1
> User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
> Accept: */*
> Host: test.abc.com
>
* Empty reply from server
* Connection 0 to host 1.1.1.1 left intact
curl: (52) Empty reply from server
* Closing connection 0
[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
20:59:12.019359 IP 10.0.35.2.41072 > 2.2.2.2.80: S 3247471255:3247471255(0) win 4380 out slot1/tmm0 lis=vs_1.1.1.1_8 flowtype=128 flowid=13B2F540 peerid=2E4AB5C0 conflags=924 inslot=0 inport=0 haunit=1 peerremote=00000000:00000000:0000FFFF:D4120404 peerlocal=00000000:00000000:0000FFFF:D4120412 remoteport=41072 localport=80 proto=0 vlan=4094
20:59:15.019116 IP 10.0.35.2.41072 > 2.2.2.2.80: S 3247471255:3247471255(0) win 4380 out slot1/tmm0 lis=vs_1.1.1.1_8 flowtype=128 flowid=13B2F540 peerid=2E4AB5C0 conflags=924 inslot=0 inport=0 haunit=1 peerremote=00000000:00000000:0000FFFF:D4120404 peerlocal=00000000:00000000:0000FFFF:D4120412 remoteport=41072 localport=80 proto=0 vlan=4094
20:59:18.218981 IP 10.0.35.2.41072 > 2.2.2.2.80: S 3247471255:3247471255(0) win 4380 out slot1/tmm0 lis=vs_1.1.1.1_8 flowtype=128 flowid=13B2F540 peerid=2E4AB5C0 conflags=924 inslot=0 inport=0 haunit=1 peerremote=00000000:00000000:0000FFFF:D4120404 peerlocal=00000000:00000000:0000FFFF:D4120412 remoteport=41072 localport=80 proto=0 vlan=4094
20:59:21.419283 IP 10.0.35.2.41072 > 2.2.2.2.80: S 3247471255:3247471255(0) win 4380 out slot1/tmm0 lis=vs_1.1.1.1_8 flowtype=128 flowid=13B2F540 peerid=2E4AB5C0 conflags=924 inslot=0 inport=0 haunit=1 peerremote=00000000:00000000:0000FFFF:D4120404 peerlocal=00000000:00000000:0000FFFF:D4120412 remoteport=41072 localport=80 proto=0 vlan=4094
Looks like the device send the request to the outside host using the wrong interface. I expected 123.123.123.123 instead of the internal address 10.0.35.2