VLAN tagging with untagged parent interface

NogBadTheBad

@johnpoz said in VLAN tagging with untagged parent interface:

you can sniff on pfsense with tcpdump directly and the -e to see vlan tags.

tcpdump -i ix0 -e would do it

So you can :)

johnpoz

saves a step if all your doing is validating there is traffic being seen tagged and untagged, etc. ;)

b82rez

Thanks for the fast replies!

Verify trunking on HP:
<sw001>display vlan 10
VLAN ID: 10
VLAN Type: static
Route Interface: not configured
Description: VLAN 0010
Name: VLAN-10
Tagged Ports:
Ten-GigabitEthernet1/0/27 <<--- PFsense
Untagged Ports: none

Caught the "Reboot to get the VLAN tagging to work" from various google searches, perhaps this is referencing an old release.

Just to confirm, it's a supported design to run IP ontop of the parent interface whilst tagging like I've done here?

I'll look at doing the capture also, thanks!

heper

If you don't have untagged ports on that vlan, you can't connect dumb clients

JeGr

@b82rez said in VLAN tagging with untagged parent interface:

Just to confirm, it’s a supported design to run IP ontop of the parent interface whilst tagging like I’ve done here?

I'd avoid it in the end to avoid debugging chaos with tagged or untagged traffic on the same interface, but yes it is working and supported. We run it like that at our office location, too. Untagged traffic (vlan1) is the old deprecated server network, all other new networks are using a proper VLAN and are tagged (or using a switch access port in the appropriate VLAN). So yes, that works.

NogBadTheBad

@jegr said in VLAN tagging with untagged parent interface:

@b82rez said in VLAN tagging with untagged parent interface:

Just to confirm, it’s a supported design to run IP ontop of the parent interface whilst tagging like I’ve done here?

I'd avoid it in the end to avoid debugging chaos with tagged or untagged traffic on the same interface, but yes it is working and supported. We run it like that at our office location, too. Untagged traffic (vlan1) is the old deprecated server network, all other new networks are using a proper VLAN and are tagged (or using a switch access port in the appropriate VLAN). So yes, that works.

I do it and use it just for my LAN management subnet, switch management addresses, wireless controller & ap YMMV.

johnpoz

Yes I run parent native (untagged) with network 192.168.2 and then vlans on top of that parent interface with different networks .3 and .4 with vlan id 3 and 4, etc.

Derelict is sure not a fan of this sort of setup :) But yes it works just fine if you know what your doing and setup your switch ports correctly.

Partly this way because unifi AP until recently had to be untagged. And previous had network is place already that used untagged, and adding the vlans to this was easier than just tagging everything, etc.

I might get around to changing it - but it works no issue, it is a well supported configuration. It allows for being able to connect a device to that port without having to worry about the device support tags, etc.

Derelict

It has its place. Unifi being one of them. It is always sort of a crap shoot how the connected switch will handle it but if it works it works. It has been a while since I saw a switch that didn't like it. I would still absolutely make the untagged VLAN on the switch something other than VLAN 1.

Another nicety is you can directly connect a laptop to the port and get to a network without having to worry about tagging traffic there. Handy for smaller networks.

Another consideration is if you run Diagnostics > Packet Capture on the parent interface, you get all traffic for all VLANs with the dot1q tags present on the tagged VLANs. This might or might not be what you want.

jahonix

I can remember times when it was a no-go to mix tagged and untagged traffic on the same interface. I still cringe when I read about it ... but try to at least.

JKnott

@jahonix said in VLAN tagging with untagged parent interface:

I can remember times when it was a no-go to mix tagged and untagged traffic on the same interface. I still cringe when I read about it ... but try to at least.

You'll find that's typical when VoIP phones and computers share the same cable. Same with WiF access points and multiple SSIDs.

JeGr

@jknott said in VLAN tagging with untagged parent interface:

@jahonix said in VLAN tagging with untagged parent interface:

I can remember times when it was a no-go to mix tagged and untagged traffic on the same interface. I still cringe when I read about it ... but try to at least.

You'll find that's typical when VoIP phones and computers share the same cable. Same with WiF access points and multiple SSIDs.

Exactly. One of the corner cases, where other solutions aren't workable (at least not with a single wire solution) ;)

But even if client ports are configured that way, one is still a bit cleaner in configuring the upstream port to pfsense as trunk with VLANs only. But that's just IMHO :)

jahonix

@jknott said in VLAN tagging with untagged parent interface:

You'll find that's typical when VoIP phones and computers share the same cable.

Do I sound as if I needed this explained?
Being able to remember the distant past but not 5 minutes ago is called Morbus Alzheimer. My mom suffers from it badly.

Same with WiF access points and multiple SSIDs.

Buy serious wireless APs with all traffic tagged, not consumer gear on steroids.