I have a machine running CentOS 6.6 connected to a port on a Cisco Catalyst
3750 series switch. That port is part of VLAN 48. I have VLAN 48 on the CentOS machine too.
The IP network on VLAN 48 is 192.168.48.0/255.255.255.0. The address on the CentOS side is 192.168.48.101, the address on the Linux end ought to be
When I only bring up eth0.48 VLAN device with the IP18.104.22.168 I have no connectivity. If I bring it up along with eth0 with another VLAN 48
address assigned to it (for instance, 192.168.48.99) I do have connectivity.
Also, strangely enough, sometimes to get things going I have to disconnect the Linux host from the switch – physically detach the wire and reconnect it again.
Be that as it may when I just bring up the VLAN by itself I have thus far been unable to get anywhere.
Has anybody seen a situation like this? Does anybody have an explaination for it?