Does not establish pppoe connection

Bugs
#1

Hello all together,

I have the problem to get pppoe to run.

My environment looks like I used a PC Engines APU.4D2/4D4 as hardware, but I have also tested it in a vm. Currently opnsense is installed and I would like to switch to vyos.
Now I have the problem that pppoe does not work. In opnsense it works fine. The internetprovider is ewetel, which is an internet provider in northern germany. As modem I use a DrayTek Vigor130, which passes the pppoe. The pppoe connection itself is available via vlan 7.

config vyos

These are the parameters in vyos:

set interfaces ethernet eth0 vif 7 description 'VDSL'
#set interfaces pppoe pppoe0 default-route 'auto'
set interfaces pppoe pppoe0 default-route 'force'
set interfaces pppoe pppoe0 mtu 1492
set interfaces pppoe pppoe0 authentication user 'n00123456#100@ab-c.de'
set interfaces pppoe pppoe0 authentication password 'testtest'
set interfaces pppoe pppoe0 source-interface 'eth0.7'
set interfaces pppoe pppoe0 service-name '1'

Username and password is anominized

I tested with vyos version 1.3 from 202205161705 and 202212201603 and copy the username and password directly from opnsense.

Config opnsense

This is the config in opnsense:

pppoe
pppoe674×681 27.6 KB

Debug

I used tcpdump to capture the network traffic on the wan port. I can’t upload cap/pcapng, so i exported it as txt via wireshark. I have anomized this and replaced the mac-address, ip-addresses, host-uniq, ac-name, ac-cockie as well as the value value in the ppp chap challengeresponse.

This is the traffic:
opnsense: pppoe-opnsense.txt (4.9 KB)
vyos: pppoe-vyos.txt (4.2 KB)

If you need more info, please just let me know.

#2

Hi @caskote,

this sounds very odd as it’s a frequent use-case. I am not an ewete customer but use Deutsche Telekom FTTH and also VDSL2 with the Vigor Modem.

This is my configuration:

set firewall options interface pppoe0 adjust-mss '1452'
set interfaces pppoe pppoe0 authentication password xxxxxx
set interfaces pppoe pppoe0 authentication user xxxxxx
set interfaces pppoe pppoe0 default-route 'auto'
set interfaces pppoe pppoe0 no-peer-dns
set interfaces pppoe pppoe0 source-interface 'eth3.7'
set nat source rule 100 outbound-interface 'pppoe0'
set nat source rule 100 source address '172.16.32.0/21'
set nat source rule 100 translation address 'masquerade'

Can you tell us what exactly is not working? Please have a live-view of the system log using: monitor log | match ppp

#3

I had some issues getting PPPoE getting up and running myself, but in the end the only thing missing was:

set interfaces pppoe pppoe0 ip adjust-mss '1452'

This is for vyos 1.4, so syntax might be different for your configuration.

#4

Hi @c-po,

I also find this very strange, I use this config myself for telekom.

So the problem is that vyos can not connect to the internet and therefore does not create a pppoe interface.

Logs

Here are the logs for my config and yours:

config:

set interfaces ethernet eth0 vif 7 description 'VDSL'
#set interfaces pppoe pppoe0 default-route 'auto'
set interfaces pppoe pppoe0 default-route 'force'
set interfaces pppoe pppoe0 mtu 1492
set interfaces pppoe pppoe0 authentication user 'n00123456#100@ab-c.de'
set interfaces pppoe pppoe0 authentication password 'testtest'
set interfaces pppoe pppoe0 source-interface 'eth0.7'
set interfaces pppoe pppoe0 service-name '1'

log:

Jan  2 08:46:22 vyos pppd[1355]: Timeout waiting for PADO packets
Jan  2 08:46:22 vyos pppd[1355]: Unable to complete PPPoE Discovery
Jan  2 08:46:52 vyos kernel: [   86.293653] pppoe0: renamed from ppp0
Jan  2 08:46:52 vyos pppd[1355]: PPP session is 116
Jan  2 08:46:52 vyos pppd[1355]: Connected to 30:b6:4f:e3:a3:d1 via interface eth0.7
Jan  2 08:46:52 vyos pppd[1355]: Renamed interface ppp0 to pppoe0
Jan  2 08:46:52 vyos pppd[1355]: Using interface pppoe0
Jan  2 08:46:52 vyos pppd[1355]: Connect: pppoe0 <--> eth0.7
Jan  2 08:46:52 vyos bgpd[888]: [EC 100663301] INTERFACE_STATE: Cannot find IF ppp0 in VRF 0
Jan  2 08:46:52 vyos systemd-udevd[1756]: link_config: could not get ethtool features for ppp0
Jan  2 08:46:52 vyos systemd-udevd[1756]: Could not set offload features of ppp0: No such device
Jan  2 08:46:53 vyos pppd[1355]: CHAP authentication failed: User check attributes mismatch
Jan  2 08:46:53 vyos pppd[1355]: CHAP authentication failed
Jan  2 08:46:53 vyos pppd[1355]: Modem hangup
Jan  2 08:46:53 vyos pppd[1355]: Connection terminated.
Jan  2 08:46:53 vyos bgpd[888]: [EC 100663301] INTERFACE_STATE: Cannot find IF pppoe0 in VRF 0
Jan  2 08:46:53 vyos pppd[1355]: Sent PADT

config:

set firewall options interface pppoe0 adjust-mss '1452'
set interfaces pppoe pppoe0 authentication user 'n00123456#100@ab-c.de'
set interfaces pppoe pppoe0 authentication password 'testtest'
set interfaces pppoe pppoe0 default-route 'auto'
set interfaces pppoe pppoe0 no-peer-dns
set interfaces pppoe pppoe0 source-interface 'eth0.7'

log:

Jan  2 08:50:40 vyos pppd[2158]: Plugin rp-pppoe.so loaded.
Jan  2 08:50:40 vyos pppd[2158]: Plugin rp-pppoe.so loaded.
Jan  2 08:50:40 vyos pppd[2158]: pppd 2.4.7 started by root, uid 0
Jan  2 08:50:40 vyos vyos-configd[604]: Received message: {"type": "node", "data": "VYOS_TAGNODE_VALUE=pppoe0/usr/libexec/vyos/conf_mode/firewall_options.py"}
Jan  2 08:50:55 vyos kernel: [   71.350021] pppoe0: renamed from ppp0
Jan  2 08:50:55 vyos pppd[2158]: PPP session is 25
Jan  2 08:50:55 vyos pppd[2158]: Connected to 30:b6:4f:e3:a3:d1 via interface eth0.7
Jan  2 08:50:55 vyos pppd[2158]: Renamed interface ppp0 to pppoe0
Jan  2 08:50:55 vyos pppd[2158]: Using interface pppoe0
Jan  2 08:50:55 vyos pppd[2158]: Connect: pppoe0 <--> eth0.7
Jan  2 08:50:55 vyos bgpd[882]: [EC 100663301] INTERFACE_STATE: Cannot find IF ppp0 in VRF 0
Jan  2 08:50:55 vyos systemd-udevd[2249]: link_config: could not get ethtool features for ppp0
Jan  2 08:50:55 vyos systemd-udevd[2249]: Could not set offload features of ppp0: No such device
Jan  2 08:50:56 vyos pppd[2158]: CHAP authentication failed: User check attributes mismatch
Jan  2 08:50:56 vyos pppd[2158]: CHAP authentication failed
Jan  2 08:50:56 vyos pppd[2158]: Modem hangup
Jan  2 08:50:56 vyos pppd[2158]: Connection terminated.
Jan  2 08:50:56 vyos bgpd[882]: [EC 100663301] INTERFACE_STATE: Cannot find IF pppoe0 in VRF 0
Jan  2 08:50:56 vyos pppd[2158]: Sent PADT

@rasmuoy , this config not exist in the version 1.4, the alternative is the config from @c-po:

set firewall options interface pppoe0 adjust-mss '1452'

But this does not solve the problem, thanks for this.

#5

@caskote looks like an authentication issue (CHAP). Can you paste the connection file from /etc/ppp/peers/ of your opnsense installation?

#6

@c-po the folder “/etc/ppp/peers” does not exist in the system, only the folder “/etc/ppp”. In this folder the file “ppp.conf” exist:

#################################################################
# PPP  Sample Configuration File
# Originally written by Toshiharu OHNO
# Simplified 5/14/1999 by wself@cdrom.com
#
# See /usr/share/examples/ppp/ for some examples
#
# $FreeBSD$
#################################################################

default:
 set log Phase Chat LCP IPCP CCP tun command
 ident user-ppp VERSION

 # Ensure that "device" references the correct serial port
 # for your modem. (cuau0 = COM1, cuau1 = COM2)
 #
 set device /dev/cuau1

 set speed 115200
 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \
           \"\" AT OK-AT-OK ATE1Q0 OK \\dATDT\\T TIMEOUT 40 CONNECT"
 set timeout 180			# 3 minute idle timer (the default)
 enable dns				# request DNS info (for resolv.conf)

papchap:
 #
 # edit the next three lines and replace the items in caps with
 # the values which have been assigned by your ISP.
 #

 set phone PHONE_NUM
 set authname USERNAME
 set authkey PASSWORD

 set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 0.0.0.0
 add default HISADDR			# Add a (sticky) default route

u3g:
 set device /dev/cuaU0.0
 set phone *99\#
 set timeout 0
 set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 0.0.0.0
 add default HISADDR			# Add a (sticky) default route
#7

Does anyone else have an idea what the problem could be?