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amish

Member

Registered: 2014-05-10

Posts: 475

[solved] new systemd-sysctl applies 99-sysctl.conf before networkd?

Recently pacman updated systemd.

I use systemd-networkd for Ethernet (wired) control (Wireless LAN is hard blocked)

I have this in /etc/sysctl.d/99-sysctl.conf

net.ipv4.ip_forward = 1

This is to allow sharing of internet where my system is gateway.

This worked fine before the recent update.

But after upgrade internet sharing stopped.

I noticed the following sysctl variables (sysctl -a)

net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.ens5.forwarding = 0
net.ipv4.conf.ppp1.forwarding = 1
net.ipv4.conf.wls1.forwarding = 1
net.ipv4.ip_forward = 1

Three strange things:

1st is wls1 is disabled yet it is shown (but lets ignore it)
ens5 fowarding is 0?? while rest all are 1.
ppp1 is actually PPPoE based connection activated by ppp@.service and runs over ens5

Once I do:
sysctl net.ipv4.conf.ens5.forwarding=1

Internet sharing starts working as expected.

So what is the issue? What changed?

Is it that systemd-sysctl gets applied before systemd-network brings ens5 up?
But then ppp1 is based on ens5 - how is that 1?

Thanks in advance.

Last edited by amish (2015-04-21 06:49:04)

amish

Member

Registered: 2014-05-10

Posts: 475

Re: [solved] new systemd-sysctl applies 99-sysctl.conf before networkd?

Looks like someone has already file bugreport:

https://bugs.freedesktop.org/show_bug.cgi?id=89509

Possible solution would be to add
IPForward=yes

to systemd-networkd .network file