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5d4fc0e665
Fixes #6282. This solution is a bit busy, but we close the race without setting *.all.*, so it is still possible to set a different setting for particular interfaces. Setting just "default" is not very useful because any interfaces present before systemd-sysctl is invoked are not affected. Setting "all" is too harsh, because the kernel takes the stronger of the device-specific setting and the "all" value, so effectively having a weaker setting for specific interfaces is not possible.
57 lines
1.9 KiB
Plaintext
57 lines
1.9 KiB
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 documentation.
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# To override settings in this file, create a local file in /etc
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# (e.g. /etc/sysctl.d/90-override.conf), and put any assignments
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# there.
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# System Request functionality of the kernel (SYNC)
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#
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# Use kernel.sysrq = 1 to allow all keys.
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# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html for a list
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# of values and keys.
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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 = 2
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net.ipv4.conf.*.rp_filter = 2
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-net.ipv4.conf.all.rp_filter
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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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net.ipv4.conf.*.accept_source_route = 0
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-net.ipv4.conf.all.accept_source_route
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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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net.ipv4.conf.*.promote_secondaries = 1
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-net.ipv4.conf.all.promote_secondaries
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# ping(8) without CAP_NET_ADMIN and CAP_NET_RAW
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# The upper limit is set to 2^31-1. Values greater than that get rejected by
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# the kernel because of this definition in linux/include/net/ping.h:
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# #define GID_T_MAX (((gid_t)~0U) >> 1)
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# That's not so bad because values between 2^31 and 2^32-1 are reserved on
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# systemd-based systems anyway: https://systemd.io/UIDS-GIDS.html#summary
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-net.ipv4.ping_group_range = 0 2147483647
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# Fair Queue CoDel packet scheduler to fight bufferbloat
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net.core.default_qdisc = fq_codel
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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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# Enable regular file and FIFO protection
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fs.protected_regular = 1
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fs.protected_fifos = 1
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