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Sherban
n00b
Joined: 18 Sep 2021
Posts: 2
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 Posted: Sat Sep 18, 2021 5:35 pm Post subject: Strange problems with bridging after systemd update 249.x |
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Hello,
I have the following Network Setup:
| Code: | "xi" (192.168.14.1) is Firewall, DHCP-Server
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+ - "omikron" (192.168.14.6) is Desktop
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+ - other pc
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+ - other pc
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+ - "my" enp1s0 (192.168.14.4)
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enp4s0 is bridged to "ny" (192.168.14.3) |
All Systems are running gentoo with systemd (except for "ny", which is a NAS).
This setup works with systemd-248.6.
After update to systemd-249.2 or systemd-249.4, "my" cannot ping or ssh to "omikron" or any other machine on my local network or the internet, except for "xi" and "ny". And vice versa, only "xi" can ping/ssh to "my". The bridge to "ny" works, "ny" is fully accessible and can access the internet.
After downgrade to systemd-248.6 "my" can reach all pc on my local network, and "my" is reachable from all pcs. Unfortunately, systemd-248.6 is no longer in the gentoo repository, making downgrading a little more complicated now.
I think, this is a systemd bug.
This is the network configuration for "my":
/etc/systemd/network/MyBridge.netdev:
| Code: | [NetDev]
Name=br0
Kind=bridge |
/etc/systemd/network/MyBridge.network
| Code: | [Match]
Name=br0
[Network]
DHCP=ipv4
LinkLocalAddressing=no
IPv6AcceptRA=no |
/etc/systemd/network/MyEnps.network
| Code: | [Match]
Name=enp1s0 enp4s0
[Network]
Bridge=br0
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Any ideas? |
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3879
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| Posted: Sat Sep 18, 2021 5:49 pm Post subject: |
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| Sherban wrote: |
/etc/systemd/network/MyBridge.network
Code:
[Match]
Name=br0
[Network]
DHCP=ipv4
LinkLocalAddressing=no
IPv6AcceptRA=no
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Try it with static ip
| Code: |
[Match]
Name=br0
[Network]
Address=10.1.10.9/24
Gateway=10.1.10.1
DNS=10.1.10.1
LinkLocalAddressing=no
IPv6AcceptRA=no
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Maybe also missing iptables kernel .config
Are you maybe trying to create a bond or a team?
What is the purpose of the bridge?
What you are describing sounds like a routing conflict like when you assign default gateway to more than one iface.
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Sherban
n00b
Joined: 18 Sep 2021
Posts: 2
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| Posted: Sun Sep 19, 2021 7:36 pm Post subject: |
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Thanks for your reply, using a static IP does work. But why?
My setup should be generally correcly configured, it worked with systemd-248.6.
Specifically I don't have iptables in my kernel .config, and I think I don't need it, because "my" is not filtering anything.
I want a bridge (and not bonding) because "my" and "ny" are remote (in my garage) and I have only one LAN port there available (and don't want to add a switch there).
"my" has four interfaces, so I connect "my" (enp1s0) to the LAN port, and "ny" to the bridged enp4s0 interface of "my".
This is the routing table of "my" with static IP for the bridge:
| Code: | Kernel IP Routentabelle
Ziel Router Genmask Flags Metric Ref Use Iface
default xi.sasthei.de.1 0.0.0.0 UG 0 0 0 br0
default xi.sasthei.de.1 0.0.0.0 UG 1002 0 0 enp1s0
192.168.14.0 0.0.0.0 255.255.255.224 U 0 0 0 br0
192.168.14.0 0.0.0.0 255.255.255.224 U 1002 0 0 enp1s0
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And this ist the routing table of "my" with DHCP for the bridge (is identical for both systemd 248.6 and systemd-149.4):
| Code: | Kernel IP Routentabelle
Ziel Router Genmask Flags Metric Ref Use Iface
default xi.sasthei.de.1 0.0.0.0 UG 1002 0 0 enp1s0
default xi.sasthei.de.1 0.0.0.0 UG 1024 0 0 br0
192.168.14.0 0.0.0.0 255.255.255.224 U 1002 0 0 enp1s0
192.168.14.0 0.0.0.0 255.255.255.224 U 1024 0 0 br0
xi.sasthei.de.1 0.0.0.0 255.255.255.255 UH 1024 0 0 br0 |
Anything wrong with that? And systemd now handles my faulty routing "correctly"? |
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3879
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| Posted: Sun Sep 19, 2021 7:49 pm Post subject: |
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| Quote: |
default xi.sasthei.de.1 0.0.0.0 UG 1002 0 0 enp1s0
default xi.sasthei.de.1 0.0.0.0 UG 1024 0 0 br0
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This is your problem.
2 default gateway for the same network.It should ONLY be one.
Somehow dhcp assigns gateway to both the bridge and the bridge-slave.
Maybe br0 should not have a default gateway.Maybe not even an address.
In my case i use br0 with only one slave.
The br0 is fully static ip configured whereas the slave has "null" config.
I use br0 for libvirt and internet.
But your case is different.
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