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https://bugzilla.redhat.com/show_bug.cgi?id=250919
--- Comment #50 from Bill Nottingham notting@redhat.com 2012-02-28 15:41:34 EST --- See /lib/udev/rules.d/99-systemd.rules, specifically where it does:
# Apply sysctl variables to network devices (and only to those) as they appear.
SUBSYSTEM=="net", KERNEL!="lo", RUN+="/lib/systemd/systemd-sysctl --prefix=/proc/sys/net/ipv4/conf/$name --prefix=/proc/sys/net/ipv4/neigh/$name --prefix=/proc/sys/net/ipv6/conf/$name --prefix=/proc/sys/net/ipv6/neigh/$name"
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