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Without this, secondary addresses would get deleted when the primary one is. This is not the desired behavior when one would like to transition from one address to another in the same subnet (such as when a new IP address is given over DHCP). In networkd, when given a new IP over DHCP we will add it, without explicitly removing the old one first (and hence never have a window without an IP address configured). Assuming the addresses are in the same subnet, that means that the old address is the primary and the new address is the secondary one. Once the old address expires, the kernel will drop it. With the old behavior this means that both addresses would be lost, which is clearly not what we want. With the new behavior, only the old address is lost, and the new one is promoted to primary. Reported by Michael Olbrich <m.olbrich@pengutronix.de>
28 lines
823 B
Plaintext
28 lines
823 B
Plaintext
# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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# See sysctl.d(5) and core(5) for for details.
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# System Request functionality of the kernel (SYNC)
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kernel.sysrq = 16
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# Append the PID to the core filename
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kernel.core_uses_pid = 1
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# Source route verification
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net.ipv4.conf.default.rp_filter = 1
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# Do not accept source routing
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net.ipv4.conf.default.accept_source_route = 0
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# Promote secondary addresses when the primary address is removed
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net.ipv4.conf.default.promote_secondaries = 1
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# Enable hard and soft link protection
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fs.protected_hardlinks = 1
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fs.protected_symlinks = 1
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