As per http://forum.vyos.net/showthread.php?tid=26854
Hi Guys
I maintain a separate network for my Wifi Clients that consists of two VyOS VMs running VRRP between them (for the gateway).
Each VM has a unique IP in 10.0.4.0/24 and VRRP is configured for 10.0.4.1 address. These two VMs also provide DHCP for this subnet and is configured using DHCP failover. Prior to this setup I was running a standalone VyOS VM (also DHCP) and had no problems whatsoever
Since replacing it with this new VRRP pair however, I'm getting a lot more disconnects from my wifi clients and I suspect its to do with DHCP. As per the below, you can see there's a lot of DHCP leases for the same IP/MAC and I'm not too sure if this is a possible problem - As an aside, I've seen that the VRRP master responds to DHCP requests from both 10.0.4.1 and 10.0.4.2 at the same time (with the same offer).
Does anyone have any thoughts on this?
> root@vy-gw-a:~# show vrrp detail > -------------------------------------------------- > Interface: eth2 > -------------- > Group: 100 > ---------- > State: MASTER > Last transition: 2d9h44s > > RFC 3768 Compliant > Virtual MAC interface: eth2v100 > Address Owner: no > > Source Address: 10.0.4.2 > Priority: 100 > Advertisement interval: 1 sec > Authentication type: IPSEC_AH > Preempt: enabled > > Sync-group: SYNC > > VIP count: 1 > 10.0.4.1/24 > > root@vy-gw-a:~# > root@vy-gw-a:~# show configuration commands | grep dhcp > set service dhcp-server disabled 'false' > set service dhcp-server shared-network-name DHCPPOOL1 authoritative 'disable' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 default-router '10.0.4.1' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 dns-server '10.0.4.1' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 domain-name 'mydomain.com' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover local-address '10.0.4.2' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover name 'DHCP-HA' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover peer-address '10.0.4.3' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover status 'primary' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 lease '7200' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 start 10.0.4.10 stop '10.0.4.50' > root@vy-gw-a:~# > root@vy-gw-a:~# show dhcp server leases > > IP address Hardware address Lease expiration Pool Client Name > ---------- ---------------- ---------------- ---- ----------- > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 21:09:52 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.30 14:dd:xx:xx:xx:xx 2016/11/07 21:10:08 DHCPPOOL1 android-d9c1cxxxxxxxxxxx > root@vy-gw-a:~#
and the other router
> root@vy-gw-b:~# show vrrp detail > -------------------------------------------------- > Interface: eth2 > -------------- > Group: 100 > ---------- > State: BACKUP > Last transition: 10h7m40s > > Master router: 10.0.4.2 > Master priority: 100 > > RFC 3768 Compliant > Virtual MAC interface: eth2v100 > Address Owner: no > > Source Address: 10.0.4.3 > Priority: 50 > Advertisement interval: 1 sec > Authentication type: IPSEC_AH > Preempt: enabled > > Sync-group: SYNC > > VIP count: 1 > 10.0.4.1/24 > > root@vy-gw-b:~# > root@vy-gw-b:~# show configuration commands | grep dhcp > set service dhcp-server disabled 'false' > set service dhcp-server shared-network-name DHCPPOOL1 authoritative 'disable' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 default-router '10.0.4.1' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 dns-server '10.0.4.1' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 domain-name 'mydomain.com' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover local-address '10.0.4.3' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover name 'DHCP-HA' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover peer-address '10.0.4.2' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 failover status 'secondary' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 lease '7200' > set service dhcp-server shared-network-name DHCPPOOL1 subnet 10.0.4.0/24 start 10.0.4.10 stop '10.0.4.50' > root@vy-gw-b:~# > root@vy-gw-b:~# show dhcp server leases > > IP address Hardware address Lease expiration Pool Client Name > ---------- ---------------- ---------------- ---- ----------- > 10.0.4.30 14:dd:xx:xx:xx:xx 2016/11/07 20:10:08 DHCPPOOL1 android-d9c1cxxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/08 05:43:20 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:13:33 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:13:33 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:13:33 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:16:22 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:16:22 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:16:22 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:25:08 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:25:08 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:25:08 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:37:16 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:37:16 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:37:16 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:43:53 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:43:53 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:43:53 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:49:49 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:49:49 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:49:49 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:55:06 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:55:06 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 20:55:06 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 21:09:52 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 21:09:52 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.29 ac:37:xx:xx:xx:xx 2016/11/07 21:09:52 DHCPPOOL1 android-38538xxxxxxxxxxx > 10.0.4.30 14:dd:xx:xx:xx:xx 2016/11/07 21:10:08 DHCPPOOL1 android-d9c1cxxxxxxxxxxx > root@vy-gw-b:~#