[Pkg-utopia-maintainers] Bug#1142714: Bug#1142714: network-manager: NetworkManager 1.58.0 ignores DHCP Router (Option 3) when Option 121 is present
Michael Biebl
biebl at debian.org
Fri Jul 24 18:51:41 BST 2026
Hi Bogdan,
thanks for the feedback.
Please report this issue to upstream then at
https://gitlab.freedesktop.org/NetworkManager/
(and please report back with the issue number so I can mark the issue as
forwarded accordingly).
Debian doesn't ship any patches in that regard, so this needs to be
handled by upstream in case there is a regression.
Thanks,
Michael
Am 24.07.26 um 17:43 schrieb Bogdan Vasiliev:
> Hi,
>
> No. I did not configure dhclient or any other DHCP backend in /etc/
> NetworkManager/.
>
> $ journalctl -b -u NetworkManager | grep "DHCP client"
> NetworkManager[1094]: <info> [1784899570.9235] dhcp: init: Using DHCP
> client 'internal'
>
> Bogdan
>
>
> On Fri, Jul 24, 2026 at 8:09 PM Michael Biebl <biebl at debian.org
> <mailto:biebl at debian.org>> wrote:
>
> Control: tags -1 + moreinfo
>
> Hi,
>
> did you use dhclient as dhcp backend via some custom setting in
> /etc/NetworkManager/?
>
> Michael
>
> Am 24.07.26 um 15:20 schrieb Bogdan Vasiliev:
> > Package: network-manager
> > Version: 1.58.0-2
> > Severity: important
> > X-Debbugs-Cc: bogdan.vasiliev at gmail.com
> <mailto:bogdan.vasiliev at gmail.com>
> >
> > After upgrading from NetworkManager 1.56.1 to 1.58.0, the default
> gateway received via DHCP Option 3 is no longer installed if the
> DHCP reply also contains RFC3442 Classless Static Routes (Option 121).
> >
> > Client tcpdump:
> > tcpdump: listening on eno1, link-type EN10MB (Ethernet), snapshot
> length 262144 bytes
> > 17:58:43.082398 ***:f5:e1 > ff:ff:ff:ff:ff:ff, ethertype IPv4
> (0x0800), length 333: (tos 0x0, ttl 64, id 0, offset 0, flags [DF],
> proto UDP (17), length 319)
> > 0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP,
> Request from ***:f5:e1, length 291, xid 0xa0bdfb95, secs 1, Flags
> [none] (0x0000)
> > Client-Ethernet-Address ***:f5:e1
> > Vendor-rfc1048 Extensions
> > Magic Cookie 0x63825363
> > DHCP-Message (53), length 1: Request
> > Client-ID (61), length 7: ether ***:f5:e1
> > Parameter-Request (55), length 17:
> > Subnet-Mask (1), Time-Zone (2), Domain-Name-Server
> (6), Hostname (12)
> > Domain-Name (15), MTU (26), BR (28), Classless-
> Static-Route (121)
> > Default-Gateway (3), Static-Route (33), YD (40), YS (41)
> > NTP (42), Unknown (119), Classless-Static-Route-
> Microsoft (249), Unknown (252)
> > RP (17)
> > MSZ (57), length 2: 576
> > Requested-IP (50), length 4: 10.10.10.2
> > Hostname (12), length 7: "chronos"
> > END (255), length 0
> > 17:58:43.086579 ***:aa:5e > ***:f5:e1, ethertype IPv4 (0x0800),
> length 364: (tos 0xc0, ttl 64, id 151, offset 0, flags [none], proto
> UDP (17), length 350)
> > 10.10.10.1.67 > 10.10.10.2.68: [udp sum ok] BOOTP/DHCP,
> Reply, length 322, xid 0xa0bdfb95, secs 1, Flags [none] (0x0000)
> > Your-IP 10.10.10.2
> > Server-IP 10.10.10.1
> > Client-Ethernet-Address ***:f5:e1
> > Vendor-rfc1048 Extensions
> > Magic Cookie 0x63825363
> > DHCP-Message (53), length 1: ACK
> > Server-ID (54), length 4: 10.10.10.1
> > Lease-Time (51), length 4: 86400
> > RN (58), length 4: 43200
> > RB (59), length 4: 75600
> > Subnet-Mask (1), length 4: 255.255.255.0
> > BR (28), length 4: 10.10.10.255
> > Default-Gateway (3), length 4: 10.10.10.1
> > Domain-Name (15), length 3: "***"
> > Hostname (12), length 7: "*****"
> > Classless-Static-Route (121), length 8:
> (10.10.20.0/24:10.10.10.3 <http://10.10.20.0/24:10.10.10.3>)
> > NTP (42), length 4: 10.10.10.1
> > Domain-Name-Server (6), length 4: 10.10.10.1
> > END (255), length 0
> >
> >
> > $ nmcli connection show LAN | grep -E 'DHCP4|IP4|ignore-auto-
> routes|route-table'
> > IP4.ADDRESS[1]: 10.10.10.2/24 <http://10.10.10.2/24>
> > IP4.GATEWAY: --
> > IP4.ROUTE[1]: dst = 10.10.10.0/24
> <http://10.10.10.0/24>, nh = 0.0.0.0, mt = 100
> > IP4.ROUTE[2]: dst = 10.10.20.0/24
> <http://10.10.20.0/24>, nh = 10.10.10.3, mt = 100
> > IP4.DNS[1]: 10.10.10.1
> > IP4.DOMAIN[1]: ***
> > DHCP4.OPTION[1]: broadcast_address =
> 10.10.10.255
> > DHCP4.OPTION[2]: dhcp_client_identifier =
> 01:***:f5:e1
> > DHCP4.OPTION[3]: dhcp_lease_time = 86400
> > DHCP4.OPTION[4]: dhcp_server_identifier =
> 10.10.10.1
> > DHCP4.OPTION[5]: domain_name = lan
> > DHCP4.OPTION[6]: domain_name_servers =
> 10.10.10.1
> > DHCP4.OPTION[7]: expiry = 1784984378
> > DHCP4.OPTION[8]: host_name = ****
> > DHCP4.OPTION[9]: ip_address = 10.10.10.2
> > DHCP4.OPTION[10]: next_server = 10.10.10.1
> > DHCP4.OPTION[11]: ntp_servers = 10.10.10.1
> > DHCP4.OPTION[12]:
> requested_broadcast_address = 1
> > DHCP4.OPTION[13]: requested_domain_name = 1
> > DHCP4.OPTION[14]:
> requested_domain_name_servers = 1
> > DHCP4.OPTION[15]: requested_domain_search = 1
> > DHCP4.OPTION[16]: requested_host_name = 1
> > DHCP4.OPTION[17]: requested_interface_mtu = 1
> > DHCP4.OPTION[18]:
> requested_ms_classless_static_routes = 1
> > DHCP4.OPTION[19]: requested_nis_domain = 1
> > DHCP4.OPTION[20]: requested_nis_servers = 1
> > DHCP4.OPTION[21]: requested_ntp_servers = 1
> > DHCP4.OPTION[22]:
> requested_rfc3442_classless_static_routes = 1
> > DHCP4.OPTION[23]: requested_root_path = 1
> > DHCP4.OPTION[24]: requested_routers = 1
> > DHCP4.OPTION[25]: requested_static_routes = 1
> > DHCP4.OPTION[26]: requested_subnet_mask = 1
> > DHCP4.OPTION[27]: requested_time_offset = 1
> > DHCP4.OPTION[28]: requested_wpad = 1
> > DHCP4.OPTION[29]:
> rfc3442_classless_static_routes = 10.10.20.0/24
> <http://10.10.20.0/24> 10.10.10.3
> > DHCP4.OPTION[30]: routers = 10.10.10.1
> > DHCP4.OPTION[31]: subnet_mask = 255.255.255.0
> > ipv4.route-table: 0 (unspec)
> > ipv4.ignore-auto-routes: no
> > ipv6.route-table: 0 (unspec)
> > ipv6.ignore-auto-routes: no
> >
> > $ ip route
> > 10.10.10.0/24 <http://10.10.10.0/24> dev eno1 proto kernel scope
> link src 10.10.10.2 metric 100
> > 10.10.20.0/24 <http://10.10.20.0/24> via 10.10.10.3 dev eno1
> proto dhcp src 10.10.10.2 metric 100
> >
> >
> > -- System Information:
> > Debian Release: forky/sid
> > APT prefers unstable
> > APT policy: (500, 'unstable')
> > Architecture: amd64 (x86_64)
> >
> > Kernel: Linux 7.1.4+deb14-amd64 (SMP w/8 CPU threads; PREEMPT)
> > Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
> > Shell: /bin/sh linked to /usr/bin/dash
> > Init: systemd (via /run/systemd/system)
> > LSM: AppArmor: enabled
> >
> > _______________________________________________
> > Pkg-utopia-maintainers mailing list
> > Pkg-utopia-maintainers at alioth-lists.debian.net <mailto:Pkg-
> utopia-maintainers at alioth-lists.debian.net>
> > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/pkg-
> utopia-maintainers <https://alioth-lists.debian.net/cgi-bin/mailman/
> listinfo/pkg-utopia-maintainers>
> >
>
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