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Otherwise it doesn't hold that VLANs 100-400 are allowed (because 201-299 are disallowed).
(cherry picked from commit ae2f3af63962ba6e2f67cfce07c9fee61722e30e)
(cherry picked from commit 9fad72cc52bdec7f44337b1e48c23ee15fc08d77)
In the troff output, this doesn't seem to make any difference. But in the
html output, the whitespace is sometimes preserved, creating an additional
gap before the following content. Drop it everywhere to avoid this.
(cherry picked from commit fe45f8dc9bf1e9be8de4e14838bc2d7befcf946b)
After 3976c430927e1bfefa0413f80ebac84ab9a64350 (#31423), IPMasquerade=
implies only per-interface IP forwarding. That means, nspawn users need
to manually enable IPv4/IPv6Forwarding= in networkd.conf when
--network-veth or friend is used. Even the change was announced in NEWS,
the change itself breaks backward compatibility and extremely reduces
usability.
Let's make the setting imply the global setting again.
Fixes#34010.
(cherry picked from commit 0b695febb22ea5701eab4aee801e8a861ffdbaa6)
Since we document /usr/local/lib/systemd/ and other paths for various things,
add notes that this is not supported if /usr/local is a separate partition. In
systemd.unit, I tried to add the footnote in the table where
/usr/local/lib/systemd/ is listed, but that get's rendered as '[sup]a[/sup]'
with a mangled footnote at the bottom of the table :( .
Also, split paragraphs in one place where the subject changes without any
transition.
Follow-up for 02f35b1c905ac63ba62f94efebf858412e961fc1.
Replaces https://github.com/systemd/systemd/pull/33231.
It has been mentioned in IPv4Forwarding= and IPv6Forwarding=,
but let's also explain in the settings who imply these settings.
Follow-up for 3976c430927e1bfefa0413f80ebac84ab9a64350 and
485f5148b3a3e5ebc7e14acef78494a98435c4b9.
Like much English text, the systemd documentation uses "may not" in the
sense of both "will possibly not" and "is forbidden to". In many cases
this is OK because the context makes it clear, but in others I felt it
was possible to read the "is forbidden to" sense by mistake: in
particular, I tripped over "the target file may not exist" in
systemd.unit(5) before realizing the correct interpretation.
Use "might not" or "may choose not to" in these cases to make it clear
which sense we mean.
LinkLocalAddressing accepts a boolean. This can be seen by looking at
`link_local_address_family_from_strong(cont char *s)` in
`src/network/netword-util.c#L102-108` which falls back to
`address_family_from_string`, defined two lines above (L100)
using `DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN`.
Running both sd-ndisc and sd-radv should be mostly a misconfiguration,
but may not. So, let's only disable sd-ndisc by default when sd-radv is
enabled, but allow when both are explicitly requested.
Then, we can read the lease file on restart, and the DHCP server will be
able to manage previously assigned addresses.
To save leases in the state directory /var/lib/systemd/network/, this
adds systemd-networkd-dhcp-server.service, and by default
systemd-networkd does not start the DHCP server without the heler
service started.
Closes#29991.
This effectively reverts 9175002864d8876f375e0df089d142d239282528.
The retrans time field in RA message is for neighbor solicitation,
and the commit d4c8de21a07d015f2f2c787e0735be5e4d02fb3c makes the value
assigned to the correct sysctl property.
Let's deprecate the option, and drop the redundant functions.
This deprecates IPForward= setting, which unconditionally controled
the global setting, even though it is a setting in .network file.
Instead, this introduces new IPv4Forwarding= and IPv6Forwarding=
settings both in .network and networkd.conf.
If these settings are specified in a .network file, then the
per-interface forwarding setting will be configured.
If specified in networkd.conf, then the global IP forwarding setting will
be configured.
Closes#30648.
E.g. a bonding port does not support addressing, hence the default
should be 'enslaved'.
Follow-up for 3255bda698d2a02ab2f2825a1e652ac6f0871a89.
Closes#27724.
The RA's Retransmission Timer field was being ignored. This resolves the IPv6
Core Conformance test, v6LC.2.1.5 [1].
Retransmission Timer is a 32-bit unsigned integer. The time, in milliseconds,
between retransmitted Neighbor Solicitation messages. Used by the Address
Resolution and Neighbor Unreachability Detection (NUD) algorithm.
Support setting a default value for the neighbour retransmission timer value with:
[Network]
IPv6RetransmissionTimeSec=<int>
By default, upon receiving a Router Advertisement with the Retransmission Timer
field set to a non-zero value, it will update the kernel's retransmit timer value.
To disable this behaviour, configure the UseIPv6RetransmissionTime= under the
[IPv6AcceptRA] section.
[IPv6AcceptRA]
UseIPv6RetransmissionTime=<bool>
RFC4861: Neighbor Discovery in IPv6
* Section 4.2 RA Message Format.
* Section 6.3.4 Processing Received Router Advertisements
A Router Advertisement field (e.g., Cur Hop Limit, Reachable Time,
and Retrans Timer) may contain a value denoting that it is
unspecified. In such cases, the parameter should be ignored and the
host should continue using whatever value it is already using. In
particular, a host MUST NOT interpret the unspecified value as
meaning change back to the default value that was in use before the
first Router Advertisement was received.
The RetransTimer variable SHOULD be copied from the Retrans Timer
field, if the received value is non-zero.
References
[1] IPv6 Core Conformance Spec (PDF)
AllowList= and DenyList= filter only DHCPOFFER messages. So, if
RapidCommit= is enabled, then networkd unconditionally accepts a rapid
ACK message even if its sender is filtered out by the lists.
As AllowList=/DenyList= implemented earlier than RapidCommit=, so
enabling RapidCommit= unconditionally by default may break existing
setups that use AllowList=/DenyList=.
Let's disable RapidCommit= by default when AllowList=/DenyList= is
enabled. Still the setting can be enabled by setting explicitly even
AllowList=/DenyList= is also specified.
When an interface is being reconfigured with different bridge vlan
settings, this makes old vlan IDs on the interface removed.
This also makes the PVID= setting support negative boolean value, e.g. "no",
in which case, the currently assigned PVID (typically, assigned by the
kernel when an interface is joined to a bridge) is dropped.
This feature is requested by #15291.
Note, if a .network file has no settings about bridge vlan, networkd
keeps the currently assigned vlan IDs. That's intended, to make not
break existing setups.
When a .network file has only PVID=no line in [BridgeVLAN] section, then
all assigned vlan IDs are removed.
Fixes#29975.
Closes#15291.
