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I have three Unbuntu 16.04.5 LTS (Xenial) servers

VMware 6.0

IP Range
AP server: 192.168.6.211
DB server: 192.168.6.212
DV server: 192.168.6.213

SN: 255.255.255.0
DG: 192.168.6.254

DNS: 192.168.6.199 (Windows 2012 R2)
DNS: 192.168.6.198 (Windows 2012 R2)

DB and DV both work fine.

When pinging the google.com or our internal mail server there is a 15-20 second delay then a drop, every time.

administrator@LDU-CRMAP-V01:~$ ping google.com

PING google.com (172.217.18.142) 56(84) bytes of data.

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=1 ttl=49 time=120 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=2 ttl=49 time=120 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=3 ttl=49 time=119 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=4 ttl=49 time=118 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=5 ttl=49 time=121 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=6 ttl=49 time=119 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=7 ttl=49 time=119 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=8 ttl=49 time=121 ms

64 bytes from mct01s09-in-f14.1e100.net (172.217.18.142): icmp_seq=9 ttl=49 time=120 ms

^C

--- google.com ping statistics ---

9 packets transmitted, 9 received, 0% packet loss, time 21139ms

rtt min/avg/max/mdev = 118.154/119.983/121.260/1.072 ms



administrator@LDU-CRMAP-V01:~$ ping mail.cockett.com

PING mail.cockett.com (192.168.6.201) 56(84) bytes of data.

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=14 ttl=128 time=0.275 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=15 ttl=128 time=0.249 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=16 ttl=128 time=0.309 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=17 ttl=128 time=0.302 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=18 ttl=128 time=0.219 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=19 ttl=128 time=0.262 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=20 ttl=128 time=0.306 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=21 ttl=128 time=0.303 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=22 ttl=128 time=0.278 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=23 ttl=128 time=0.321 ms

64 bytes from ldu-ex16-v01.cockett.com (192.168.6.201): icmp_seq=24 ttl=128 time=0.299 ms

^C

--- mail.cockett.com ping statistics ---

24 packets transmitted, 11 received, 54% packet loss, time 22999ms

rtt min/avg/max/mdev = 0.219/0.283/0.321/0.037 ms





hosts

192.168.6.199   ldu-dc-v01.cockett.com

192.168.6.198   ldu-dc-v02.cockett.com

127.0.0.1       localhost

127.0.0.1       LDU-CRMAP-V01

#127.0.1.1      LDU-CRMAP-V01



# The following lines are desirable for IPv6 capable hosts

::1     localhost ip6-localhost ip6-loopback

ff02::1 ip6-allnodes

ff02::2 ip6-allrouters





/etc/network$ cat interfaces

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).



source /etc/network/interfaces.d/*



# The loopback network interface

auto lo

iface lo inet loopback



# The primary network interface

auto ens160

iface ens160 inet static

address 192.168.6.211

netmask 255.255.255.0

gateway 192.168.6.254

dns-nameservers 192.168.6.199 192.168.6.198

I have also shut the server down and removed the network adapter restarted, then shutdown and added the adapter again.

The ping worked perfectly for a couple of minutes then back to the huge delays.

administrator@LDU-CRMAP-V01:/etc/network$ nslookup mail.cockett.com

Server:         192.168.6.199

Address:        192.168.6.199#53



Name:   mail.cockett.com

Address: 192.168.6.201



mtr mail.cockett.com shows 0% drops

The issue is causing SSO to time out and mails to no be delivered.

Your guidance would be appreciated.

@heynnema

administrator@LDU-CRMAP-V01:/etc$ cat /etc/netplan/.yaml
cat: '/etc/netplan/.yaml': No such file or directory
administrator@LDU-CRMAP-V01:/etc$ sudo lshw -C network
[sudo] password for administrator:
*-network
description: Ethernet interface
product: VMXNET3 Ethernet Controller
vendor: VMware
physical id: 0
bus info: pci@0000:03:00.0
logical name: ens160
version: 01
serial: 00:50:56:91:51:0a
size: 10Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list rom ethernet physical logical tp 1000bt-fd
configuration: autonegotiation=off broadcast=yes driver=vmxnet3 driverversion=1.4.14.0-k-NAPI duplex=full ip=192.168.6.211 latency=0 link=yes multicast=yes port=twisted pair speed=10Gbit/s
resources: irq:18 memory:fd5fc000-fd5fcfff memory:fd5fd000-fd5fdfff memory:fd5fe000-fd5fffff ioport:4000(size=16) memory:fd500000-fd50ffff
administrator@LDU-CRMAP-V01:/etc$
administrator@LDU-CRMAP-V01:/etc$
administrator@LDU-CRMAP-V01:/etc$ sudo lshw -C resolvectl
administrator@LDU-CRMAP-V01:/etc$ sudo lshw -C resolvctl
administrator@LDU-CRMAP-V01:/etc$

The three servers are all on the same subnet and VLAN, using the same virtual switch. All using the same VMware cluster and switches.

Thank you