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There are different health-monitors in LBaaS:
1) PING 2) TCP 3) HTTP and 4) HTTPS

I was trying PING health-monitor with Haproxy, but it seem to be sending
TCP requests to the members instead of PING requests.


varunlodaya@ubuntu:~$ neutron lb-healthmonitor-show fb5d0e4b-5763-4f38-bf2c-09f9f7ab2e49
+----------------+-----------------------------------------------------------------------------------------------------+
| Field          | Value                                                                                               |
+----------------+-----------------------------------------------------------------------------------------------------+
| admin_state_up | True                                                                                                |
| delay          | 30                                                                                                  |
| id             | fb5d0e4b-5763-4f38-bf2c-09f9f7ab2e49                                                                |
| max_retries    | 2                                                                                                   |
| pools          | {"status": "ACTIVE", "status_description": null, "pool_id": "93d03b4e-05a5-4691-b36f-1416b96c3751"} |
| tenant_id      | 6d560cf5767d4f17a61ebc11c14bc1cc                                                                    |
| timeout        | 5                                                                                                   |
| type           | PING                                                                                                |
+----------------+-----------------------------------------------------------------------------------------------------+


The Haproxy config it generates for backend is:

*********
backend 93d03b4e-05a5-4691-b36f-1416b96c3751
        mode http
        balance roundrobin
        option forwardfor
        timeout check 5s
        server 07285f2e-9e9f-41ad-a343-2f1d7296f2d9 10.0.0.4:80 weight 1 check inter 30s fall 2

On the member, I opened tcpdump to check whats being received:

sudo tcpdump -i eth0 -v icmp
sudo: unable to resolve host ubuntu-vm
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel

ubuntu@ubuntu-vm:~$ sudo tcpdump -i eth0 -n src host 10.0.0.5 -vv
sudo: unable to resolve host ubuntu-vm
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
23:03:53.434592 IP (tos 0x0, ttl 64, id 4614, offset 0, flags [DF], proto TCP (6), length 60)
    10.0.0.5.55697 > 10.0.0.4.80: Flags [S], cksum 0xc228 (correct), seq 3491668946, win 29200, options [mss 1460,sackOK,TS val 1552852 ecr 0,nop,wscale 7], length 0
23:03:58.441968 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.4 tell 10.0.0.5, length 28
23:04:23.439097 IP (tos 0x0, ttl 64, id 30112, offset 0, flags [DF], proto TCP (6), length 60)
    10.0.0.5.55704 > 10.0.0.4.80: Flags [S], cksum 0x3862 (correct), seq 635615873, win 29200, options [mss 1460,sackOK,TS val 1560353 ecr 0,nop,wscale 7], length 0
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernel

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: lbaas
-- 
PING health-monitor in LBaaS Haproxy sends a TCP request to members 
https://bugs.launchpad.net/bugs/1426151
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