Debian Linux "stretch" DHCP issues

[LoPath]

Need some help with a weird issue I'm fighting with... I have some "all-in-one" PC's that are purpose-built for a dispatch console system. They run on Debian Linux. They worked great on Debian 8-Jessie, but we had to update them to Debian 9-Stretch for an updated software package. Here in my office, they worked great. When I deployed them to the field, they don't want to work right with the customer's network. Something with the network keeps pushing them to go to DHCP, even though I set them up for a static IP. Something in the system is appending a line "source interfaces.d/vlan" to the end of my interfaces file that's forcing it to use these VLAN settings and DHCP.

Here is the /etc/network/interfaces.d/vlan file that's hijacking my settings:

auto bond0.552
allow-hotplug bond0.552
iface bond0.552 inet dhcp
vlan-raw-device bond0

auto bond0.552
allow-hotplug bond0.552
iface bond0.552 inet6 dhcp
vlan-raw-device bond0

If I make any changes to this VLAN file, they get overwritten. If I make any changes to the /etc/network/interfaces file, the line "source interfaces.d/vlan gets automatically appended to the end.

My end goal here is to either force the system to use VLAN 551 on DHCP or a static IP. Thoughts/Help??

LoPath
Maintain HiPath 4000 V5 & V6, OpenScape Xpert V4 & V6, OpenScape Xpressions V7, OpenScape Contact Center V8, OpenScape Voice V9

 

[LoPath]

The solution - in the newer software, LLDP is turned on by default. LLDP was hijacking my settings. Disabling LLDP fixed it. I had to log into the terminal and enter "systemctl start stop-lldpd".

LoPath
Maintain HiPath 4000 V5 & V6, OpenScape Xpert V4 & V6, OpenScape Xpressions V7, OpenScape Contact Center V8, OpenScape Voice V9