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docs: net: document neigh gc_interval sysctl

Add entry for the neigh/default/gc_interval sysctl. This sysctl is
unused since kernel v2.6.8.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Gabriel Goller <g.goller@proxmox.com>
Link: https://patch.msgid.link/20260225095822.44050-1-g.goller@proxmox.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Gabriel Goller and committed by
Jakub Kicinski d68d21ea 5c894879

+7
+7
Documentation/networking/ip-sysctl.rst
··· 202 202 203 203 Default: 1024 204 204 205 + neigh/default/gc_interval - INTEGER 206 + Specifies how often the garbage collector for neighbor entries 207 + should run. This value applies to the entire table, not 208 + individual entries. Unused since kernel v2.6.8. 209 + 210 + Default: 30 seconds 211 + 205 212 neigh/default/gc_stale_time - INTEGER 206 213 Determines how long a neighbor entry can remain unused before it is 207 214 considered stale and eligible for garbage collection. Entries that have