Arch Linux

nationday

Member

Registered: 2025-10-01

Posts: 3

[SOLVED] After pacman update,ipv4 does not work

system : 6.16.8-arch3-1

after update,my archlinux cannot reachout ipv4 address anymore,but ipv6 works ok.

ping archlinux.org
PING archlinux.org (2a01:4f9:c010:6b1f::1) 56 data bytes
64 bytes from archlinux.org (2a01:4f9:c010:6b1f::1): icmp_seq=1 ttl=46 time=286 ms
64 bytes from archlinux.org (2a01:4f9:c010:6b1f::1): icmp_seq=2 ttl=46 time=284 ms
64 bytes from archlinux.org (2a01:4f9:c010:6b1f::1): icmp_seq=3 ttl=46 time=282 ms
64 bytes from archlinux.org (2a01:4f9:c010:6b1f::1): icmp_seq=4 ttl=46 time=288 ms
64 bytes from archlinux.org (2a01:4f9:c010:6b1f::1): icmp_seq=5 ttl=46 time=282 ms
64 bytes from archlinux.org (2a01:4f9:c010:6b1f::1): icmp_seq=6 ttl=46 time=291 ms
--- archlinux.org ping statistics ---
7 packets transmitted, 6 received, 14.2857% packet loss, time 6673ms
rtt min/avg/max/mdev = 282.251/285.664/291.045/3.215 ms

ping 2a01:4f9:c010:6b1f::1
PING 2a01:4f9:c010:6b1f::1 (2a01:4f9:c010:6b1f::1) 56 data bytes
64 bytes from 2a01:4f9:c010:6b1f::1: icmp_seq=2 ttl=46 time=276 ms
64 bytes from 2a01:4f9:c010:6b1f::1: icmp_seq=3 ttl=46 time=286 ms
64 bytes from 2a01:4f9:c010:6b1f::1: icmp_seq=4 ttl=46 time=288 ms
--- 2a01:4f9:c010:6b1f::1 ping statistics ---
6 packets transmitted, 3 received, 50% packet loss, time 5053ms
rtt min/avg/max/mdev = 275.548/283.428/288.457/5.642 ms

but:

ping 9.9.9.9
ping: connect: Network is unreachable
ping 223.6.6.6
ping: connect: Network is unreachable

system use  systemd-networkd and systemd-resolved for networks,dns still works.

Last edited by nationday (2025-10-02 01:13:05)

-thc

Member

Registered: 2017-03-15

Posts: 992

Re: [SOLVED] After pacman update,ipv4 does not work

Please post the output of

ip a
ip r

and the "network" file contents of the adapter that should acquire an IPv4 address (e.g. "/etc/systemd/network/10-wired.network").

nationday

Member

Registered: 2025-10-01

Posts: 3

Re: [SOLVED] After pacman update,ipv4 does not work

thank you for help

 ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:23:40:0b:6f brd ff:ff:ff:ff:ff:ff
    altname enx00e023400b6f
    inet 192.168.2.7/24 brd 192.168.2.255 scope global enp2s0
       valid_lft forever preferred_lft forever
    inet6 2409:8a28:39e4:8614:2e0:23ff:fe40:b6f/64 scope global dynamic mngtmpaddr noprefixroute
       valid_lft 195604sec preferred_lft 109204sec
    inet6 fe80::2e0:23ff:fe40:b6f/64 scope link proto kernel_ll
       valid_lft forever preferred_lft forever

 ip r
192.168.2.0/24 dev enp2s0 proto kernel scope link src 192.168.2.7

cat /etc/systemd/network/20-wired.network
[Match]
Name=enp2s0

[Network]
Address=192.168.2.7/24
Gateway=192.168.2.1/24
DNS=223.5.5.5
DNS=114.114.114.114
#DNS=1.1.1.1
#DNS=185.181.61.24
#DNS=94.247.43.254

btw another win-pc works fine under same network,so i guess it's a archlinux system problem.

Last edited by nationday (2025-10-01 15:30:32)

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 68,828

Re: [SOLVED] After pacman update,ipv4 does not work

Please use [code][/code] tags, not "quote" tags. Edit your post in this regard.
You don't have a default route. Idk how networkd handles this but it should likely be

Gateway=192.168.2.1

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-thc

Member

Registered: 2017-03-15

Posts: 992

Re: [SOLVED] After pacman update,ipv4 does not work

Yep - I just tested it: If you add "/24" to the Gateway the default route will not be set.

nationday

Member

Registered: 2025-10-01

Posts: 3

Re: [SOLVED] After pacman update,ipv4 does not work

yes,it works.thank you.
strange this worked for months,but breaks today.

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 68,828

Re: [SOLVED] After pacman update,ipv4 does not work

\o/
Please always remember to mark resolved threads by editing your initial posts subject - so others will know that there's no task left, but maybe a solution to find.
Thanks.

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