IFACE: Adding IPv4 address to ng0 failed: File exists + iBGP or OSPF

[Grzesiek G]

The configuration is
FreeBSD 14.1-RELEASE-p5
mpd5-5.9_18
Bird2
Two PPPoE routers running the mpd daemon.
Broadcasting combined PPPoE routes between PPPoE and BGP routers (bird2).
Pppoe login associated with a static IP/32 address.

MPD does not establish a tunnel if there is an entry from the bird daemon in the Routing table.

net.route.multipath: 1

error
[B-1] IFACE: Adding IPv4 address to ng0 failed: File exists

netstat -rn
10.20.20.2 10.10.10.1 UGH em1

mpd.conf
pppoe_server:

    create bundle template B
    set ipcp ranges 192.168.249.1 127.0.0.2
    set ipcp dns 10.20.30.1 10.20.30.2
    set ipcp no vjcomp
    set iface enable tcpmssfix
    set iface mtu 1500
    set iface group tun
    set iface up-script /usr/local/etc/mpd5/vpn-linkup
    set iface down-script /usr/local/etc/mpd5/vpn-linkdown

    create link template common pppoe

    set link action bundle B
    set link disable pap eap
    set link enable chap
    set link mtu 1492
    set link mru 1492
    set link keep-alive 20 40
    set auth disable internal
    set auth max-logins 1 CI
    set link no multilink
    set link latency 1
    load radius
    set pppoe service "

mpd5 erroe
[igb0-3] RADIUS: Rec'd RAD_ACCOUNTING_RESPONSE for user 'userppoe'
[B-1] IPCP: rec'd Configure Request #106 (Ack-Rcvd)
[B-1] IPADDR 0.0.0.0
[B-1] NAKing with 10.20.20.2
[B-1] PRIDNS 0.0.0.0
[B-1] NAKing with 10.20.30.1
[B-1] SECDNS 0.0.0.0
[B-1] NAKing with 10.20.30.2
...
[B-1] IPCP: state change Ack-Rcvd --> Opened
[B-1] IPCP: LayerUp
[B-1] 192.168.249.1 -> 10.20.20.2
[B-1] IFACE: Adding IPv4 address to ng0 failed: File exists
[B-1] IFACE: IfaceChangeAddr() error, closing IPCP
[B-1] IPCP: parameter negotiation failed
[B-1] IPCP: state change Opened --> Stopping
[B-1] IPCP: SendTerminateReq #2
[B-1] IPCP: LayerDown
[B-1] IFACE: Removing IPv4 address from ng0 failed: Can't assign requested address

[Eugene Grosbein]

This is known and yet unfixed problem in FreeBSD 14.0+ kernel.
You may find 13.4-RELEASE more usable until that's fixed.

[Eugene Grosbein]

Refer to https://reviews.freebsd.org/D46301 for defails.

[Eugene Grosbein]

Sorry, I referred to different problem. The one I meant is https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277125
The fix has been committed to CURRENT but not in STABLE branches yet.

Are you in position to test the fix with your system? You'll need to install sources, apply attached patch, rebuild kernel only, install the kernel and reboot.

[Eugene Grosbein]

Nevermind. I've managed to test the fix myself, it works. I've merged the fix to stable branches.
So, you can either update to 14.2-STABLE or wait for 14.3-RELEASE.

[Grzesiek G]

I updated to version 14.3. I tested it and it works as expected.
Thank you for your help.

[Yannick C]

Hi Grzesiek,
It looks we have the same bug, I've updated to FreeBSD 14.3-RELEASE and the bug is still present for me.
please check my post :
https://sourceforge.net/p/mpd/discussion/44693/thread/2b3e5ea536/?limit=100