I am unable to capture lvsadm traffic on the loopback interface.
I am sucessfully sending traffic to my SIEM via ipvsadm.
I was able to do this on both interfaces; ens192 and interface lo.
I had no issues using tcpdump to view traffic being sent via ipvsadm on
interface ens192.
My problem is that when i use tcpdump on interface lo I do not see any
ipvsadm traffic.
** When I run tcpdump I don't see any udp traffic
# tcpdump -i lo -n udp port 51444 -vv
tcpdump: listening on lo, link-type EN10MB (Ethernet), capture size 262144
bytes
# ifconfig
ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.10.136 netmask 255.255.255.0 broadcast 10.0.10.255
ether 00:50:56:ce:e3:dc txqueuelen 1000 (Ethernet)
RX packets 63480807660 bytes 12508576879467 (11.3 TiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 19861938950 bytes 5978856268385 (5.4 TiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 351855 bytes 1689650676 (1.5 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 351855 bytes 1689650676 (1.5 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
** ipvsadm commands to set up round robin load balancing to three SIEM
nodes **
# ipvsadm -A -u 127.0.0.1:51444 -s rr -o
# ipvsadm -a -u 127.0.0.1:51444 -r 10.10.10.77:514 -m -w 1
# ipvsadm -a -u 127.0.0.1:51444 -r 10.10.10.78:514 -m -w 1
# ipvsadm -a -u 127.0.0.1:51444 -r 10.10.10.79:514 -m -w 1
# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
UDP localhost:51444 rr ops
-> 10.10.10.77:syslog Masq 1 0 1
-> 10.10.10.78:syslog Masq 1 0 2
-> 10.10.10.79:syslog Masq 1 0 2
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