after struggling with this problem for some time, I decided to ask for help.
I am running a network of three IPFire connected by VPN for about 2 years now, before that I used IPCop for more than 10 years until the development of IPCop was stopped.
Our 3 locations were connected to internet by Telekom VDSL (location A and B) and M-Net ADSL (location C). Beginning of this year M-Net told me that they had to switch my connection to VDSL because the old was based on ISDN.
This was done with the two Telekom connections already without greater problems before, because oft that I did not worry about it.
The only thing that I had to change was to replace the old ADSL modem with a modem that was capable of VDSL2. I bought the successor of my Zyxel VMG1312-B30A, the Zyxel VMG3006-D70A and set it to modem mode. I tested it with IPCop A and VDSL A and it was working fine.
After the connection change on Location C I replaced the old modem with the new one and tried to connect, but it did not work, the connection daemon could not connect, in the messages file there were entries like this: (It was every time the timeout waiting for PADO packets, this log entry is from a later connect try):
Apr 5 11:02:40 Gatekeepix pppd: Plugin rp-pppoe.so loaded.
Apr 5 11:02:40 Gatekeepix pppd: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.7
Apr 5 11:02:40 Gatekeepix connectd: Connectd (start) started with PID 22083
Apr 5 11:02:40 Gatekeepix pppd: pppd 2.4.7 started by root, uid 0
Apr 5 11:02:42 Gatekeepix kernel: tg3 0000:03:00.1 red0: Link is up at 100 Mbps, full duplex
Apr 5 11:02:42 Gatekeepix kernel: tg3 0000:03:00.1 red0: Flow control is on for TX and on for RX
Apr 5 11:02:42 Gatekeepix kernel: tg3 0000:03:00.1 red0: EEE is disabled
Apr 5 11:02:42 Gatekeepix unbound: [22119:0] notice: init module 0: validator
Apr 5 11:02:42 Gatekeepix unbound: [22119:0] notice: init module 1: iterator
Apr 5 11:02:42 Gatekeepix unbound: [22119:0] info: start of service (unbound 1.8.1).
Apr 5 11:03:55 Gatekeepix pppd: Timeout waiting for PADO packets
Apr 5 11:03:55 Gatekeepix pppd: Unable to complete PPPoE Discovery
Apr 5 11:03:55 Gatekeepix pppd: Exit.
Apr 5 11:03:55 Gatekeepix connectd: No pppd is running. Trying reconnect.
After that I took the modem again back to Location A and tested it again. It worked fine. I took the old modem, that was in use for many years to Location C and tried to connect – same error.
I carried Router C and the modem to Location A and tried to connect – same error.
Both modems were tested with IPFire A and worked without problems.
I replaced the hard disk of Router C with a new one and installed the most recent copy of IPFire with connection to the new VDSL modem – same error
I installed the Router C with Windows 10 to test the LAN interfaces. Both LAN Interfaces work without problems.
A & B: Supermicro Mainboard A2SDi-2C-HLN4F, 2018
C: HP Proliant Microserver Gen 8, 2015
Now I am running out of ideas what to do next and I am very thankful for every hint.