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PPPoE on VLAN - impossible in UTM?

I am trying to set up a Sophos UTM machine with one NIC and three VLANS:

VLAN 2 = LAN
VLAN 3 = ISP via PPPoE
VLAN 4 = ISP via regular ethernet.

This setup works just fine in pfSense, but in Sophos, even though the menu options and functions seem to be there, I get an error message "Interface type requires exclusive access to the network interface" when I am trying to set up the VLAN 3 connection.

Here is a screenshot:

Is this really limitation of Sophos UTM 9.4, or am I just doing something wrong?

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0 sachingurung over 7 years ago

Hi Lock,

I see that you have two VLAN on eth0. Can you configure eth0 exclusively for the VDSL line. I think that should resolve your issue. I see that we do not have a KBA for VDSL configuration but check this external KBA here.

Hope that helps :)

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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0 Lock heed over 7 years ago in reply to sachingurung

As I mentioned, I need to have three VLANs on eth0 (I only have one NIC), and one of them needs to be DSL PPPoE.

And I cannot go any further into configuration you linked to, because I cannot save the interface state.
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0 Lock heed over 7 years ago in reply to Lock heed

Judging from this thread it was possible: https://community.sophos.com/products/unified-threat-management/f/hardware-installation-up2date-licensing/29112/pppoe-over-vlan but apparently it no longer is (vide: my screenshot from the first ). It appears to be either a regression/bug or purposeful removal of feature.

This is very unfortunate and I would be happy if there was a way around it, like setting up VLANs from command line.
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0 sachingurung over 7 years ago in reply to Lock heed

Hi Lock,

If you check the help doc for UTM; in the interface> Ethernet section it states: For an external connection (e.g., to the Internet) choose the network card with SysID eth1. Please note that one network card cannot be used as both an Ethernet interface and a PPP over Ethernet (PPPoE DSL) or PPTP over Ethernet (PPPoA DSL) connection simultaneously.

Hence, not possible.

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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0 sachingurung over 7 years ago in reply to Lock heed

Hi Lock,

If you check the help doc for UTM; in the interface> Ethernet section it states: For an external connection (e.g., to the Internet) choose the network card with SysID eth1. Please note that one network card cannot be used as both an Ethernet interface and a PPP over Ethernet (PPPoE DSL) or PPTP over Ethernet (PPPoA DSL) connection simultaneously.

Hence, not possible.

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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0 Lock heed over 7 years ago in reply to sachingurung

I see. Thanks.
I don't understand why this limitation has been introduced. Doesn't make sense to me.
In pfSense there is no problem of using the same physical interface to multiple VLANs, including PPPoE DLS connections.
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