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| author | Benedikt Morbach <benedikt.morbach@googlemail.com> | 2015-05-10 20:52:40 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2015-05-15 12:13:35 +0200 |
| commit | 505c5f6de1a5c0afb238a46db94fe3571902cc9d (patch) | |
| tree | 2cd76ca1686b1a036b98eb19cc7c10ab465c97c0 /man/systemd.network.xml | |
| parent | 57ab2eabb8f92fad5239c7d4492e9c6e23ee0678 (diff) | |
networkd: don't touch global forwarding setting
This reverts commit 43c6d5abacaebf813845934ec8d5e5ee3c431854
(and a small part of 4046d8361c55c80ab8577aea52523b9e6eab0d0c)
It turns out we don't actually need to set the global ip_forward setting.
The only relevant setting is the one on each interface.
What the global toggle actually does is switch forwarding on/off for all
currently present interfaces and change the default for new ones.
That means that by setting the global ip_forward we
- Introduce a race condition, because if the interface with IPForward=yes
is brought up after one with IPForward=no, both will have forwarding
enabled, because the global switch turns it on for all interfaces.
If the other interface comes up first networkd correctly sets forward=0
and it doesn't get overridden.
- Change the forwarding setting for interfaces that networkd is not
configured to touch, even if the user disabled forwarding via sysctl,
either globally or per-interface
As forwarding works fine without this, as long as all relevant interfacest
individually set IPForward=yes: just drop it
This means that non-networkd interfaces use the global default while
networkd interfaces default to off if IPForward isn't given.
Diffstat (limited to 'man/systemd.network.xml')
| -rw-r--r-- | man/systemd.network.xml | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/man/systemd.network.xml b/man/systemd.network.xml index 4be9d13011..31484d8436 100644 --- a/man/systemd.network.xml +++ b/man/systemd.network.xml @@ -373,9 +373,7 @@ globally turned on in the kernel, with the <filename>net.ipv4.ip_forward</filename> and <filename>net.ipv4.ip_forward</filename> sysctl - options. Also, if this option is enabled for at least one - interface, the global options in the kernel are also enabled - as necessary, to ensure IP forwarding can take place.</para> + options.</para> </listitem> </varlistentry> <varlistentry> |