Add ntable to ip man page

Add some documentation about ip neighbour table parameter command.

man/man8/ip.8

@@ -353,6 +353,46 @@ throw " | " unreachable " | " prohibit " | " blackhole " | " nat " ]"
 .B  nud
 .IR STATE " ]"
 
+.ti -8
+.BR "ip ntable change name"
+.IR NAME " [ "
+.B dev
+.IR DEV " ] " PARMS
+
+.ti -8
+.IR PARMS " := { "
+.B thresh1
+.IR VAL " | "
+.B thresh2
+.IR VAL " | "
+.B thresh3
+.IR VAL " | "
+.B gc_int
+.IR MSEC " | "
+.B base_reachable
+.IR MSEC " | "
+.B retrans
+.IR MSEC " | " "gc_stale MSEC " " | "
+.B delay_probe
+.IR MSEC " | " "queue LEN " " | "
+.B app_probs
+.IR VAL " | "
+.B ucast_probes
+.IR VAL " | " "mcast_probes VAL " " | "
+.B anycast_delay
+.IR MSEC " | "
+.B proxy_delay
+.IR MSEC " | " "proxy_queue LEN " " | "
+.B locktime
+.IR MSEC " }"
+
+.ti -8
+.BR "ip ntable show" " [ "
+.B dev
+.IR DEV " ] [ "
+.B name
+.IR NAME " ]"
+
 .ti -8
 .BR "ip tunnel" " { " add " | " change " | " del " | " show " | " prl " }"
 .RI "[ " NAME " ]"
@@ -1473,6 +1513,32 @@ twice,
 .B ip neigh flush
 also dumps all the deleted neighbours.
 
+.SH ip ntable - neighbour table configuration
+Display and change the parameters for the neighbour tables.
+
+.SS ip ntable show - list the ip neighbour tables
+
+This commands displays neighbour table parameters and statistics.
+
+.TP
+.BI dev " DEV"
+only list the table attached to this device.
+
+.TP
+.BI name " NAME"
+only lists the table with the given name.
+
+.SS ip ntable change - modify table parameter
+
+This command allows modifying table parameters such as timers and queue lengths.
+.TP
+.BI name " NAME"
+the name of the table to modify.
+
+.TP
+.BI dev " DEV"
+the name of the device to modify the table values.
+
 .SH ip route - routing table management
 Manipulate route entries in the kernel routing tables keep
 information about paths to other networked nodes.