hi,
I have 4 vlans and a number of hosts connected to it - and one oddity, well, it boggles my mind and I cannot see - most likely obvious - reason for this weird situation.
Very last Vlan I created for the moment has no connections to any port, but! - as soon as any one member port goes up - physical link on - then one of the hosts/nodes becomes unavailable to some some part of the network, let me call it hostXX
Vlans:
1 vlan 1 192.168.2.1 255.255.255.0
2 vlan 2 192.168.3.1 255.255.255.0
3 vlan 3 172.25.12.201 255.255.255.0 # here is Vlan which when a port is active then ...
4 vlan 4 10.5.6.1 255.255.255.0
and that hostXX's routing:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.5.6.1 0.0.0.0 UG 100 0 0 p3p1
0.0.0.0 192.168.2.100 0.0.0.0 UG 110 0 0 em2
0.0.0.0 131.111.42.62 0.0.0.0 UG 199 0 0 em3
one difference between hostXX and other hosts which remain accessible & unaffected is, other hosts have:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.2.100 0.0.0.0 UG 100 0 0 enp2s0f0
That 192.168.2.100 gateway is a host(not the switch) that connects to external Intranet and switch's 192.168.2.0/24 is the Default Vlan as above.
My wild guess is that hostXX's gateway - 10.5.6.1 is switch's Vlan 4 - being first on kernel routing list, does not do something to manage that traffic from hostXX's 10.5.6.100.
But why would this only happen when there is a link on any member port of Vlan 3 and problem does not exist when no port is active/connected?
many thanks.
