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maxxim
n00b
Joined: 03 Feb 2015
Posts: 27
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 Posted: Thu Sep 02, 2021 10:55 am Post subject: Prevent DHCP lease from getting stale due to suspend/resume |
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Hi there,
I often suspend/resume my machine multiple times over longer periods of time - at least twice a day for several weeks unless I really need to reboot due a new kernel or something like that.
However, it seems the DHCP lease is becoming stale after a few days, i.e. my machine still has network access, but its hostname becomes unreachable for other clients.
I thought about creating a hook in '/lib64/elogind/system-sleep' that restarts the ethernet service when resuming, but I wonder if there's some configuration option in '/etc/conf.d/net' that can help here instead.
My current config is:
| Code: | # Ethernet configuration
config_enp34s0="dhcp"
ethtool_change_enp34s0="wol g" |
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eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9710
Location: almost Mile High in the USA
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| Posted: Thu Sep 02, 2021 12:55 pm Post subject: |
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You may need to do that - add a hook to reload on resume... what are you using to detect network connection, just straight openrc/dhcpcd?
I use networkmanager for machines that may suspend/resume/change network position. It requests a new DHCP lease with the same request each time upon resume as it knows when these events happen through dbus.
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Tony0945
Watchman
Joined: 25 Jul 2006
Posts: 5127
Location: Illinois, USA
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| Posted: Thu Sep 02, 2021 1:25 pm Post subject: |
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Use a static address that is permanently in the other machines' /etc/hosts?
Assign a fixed address reservation by MAC in the DHCP server? |
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maxxim
n00b
Joined: 03 Feb 2015
Posts: 27
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| Posted: Thu Sep 02, 2021 5:07 pm Post subject: |
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| eccerr0r wrote: | You may need to do that - add a hook to reload on resume... what are you using to detect network connection, just straight openrc/dhcpcd?
I use networkmanager for machines that may suspend/resume/change network position. It requests a new DHCP lease with the same request each time upon resume as it knows when these events happen through dbus. |
Yes, I'm using straight OpenRC / dhcpcd + ifplugd for ethernet. NetworkManager would be an option. But I'd like to think there's also some dhcpcd option for this, something in the lines of 'discard lease if older than x hours and request new one'. |
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maxxim
n00b
Joined: 03 Feb 2015
Posts: 27
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| Posted: Thu Sep 02, 2021 5:09 pm Post subject: |
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| Tony0945 wrote: | Use a static address that is permanently in the other machines' /etc/hosts?
Assign a fixed address reservation by MAC in the DHCP server? |
Those are two viable solutions, but I'd probably use to the elogind hook instead. |
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