Index: eoip.4
===================================================================
RCS file: /cvs/src/share/man/man4/eoip.4,v
retrieving revision 1.4
diff -u -p -r1.4 eoip.4
--- eoip.4	29 May 2019 19:37:06 -0000	1.4
+++ eoip.4	30 Sep 2019 00:11:55 -0000
@@ -83,12 +83,68 @@ route to the tunnel destination than the
 via the tunnel interface.
 Alternatively, the tunnel traffic may be configured in a separate
 routing table to the encapsulated traffic.
+.Ss Network Interface Administration
+.Nm
+interfaces may be configured by
+.Xr ifconfig 8
+or
+.Xr netstart 8
+using the following options:
+.Bl -tag -width indent
+.It Cm tunnel Ar src_address dest_address
+Set the unicast IPv4 or IPv6 addresses for the encapsulating IP packets.
+The addresses may only be configured while the interface is down.
+.It Fl Ns Cm tunnel
+Clear the addresses used for the encapsulating IP packets.
+The addresses may only be cleared while the interface is down.
+.It Cm vnetid Ar tunnel-identifier
+Configure the virtual network identifier to use as the Tunnel Identifier.
+The virtual network identifier may only be configured while the
+interface is down.
+The Tunnel Identifier is a 16-bit value between 0 and 65535 inclusive.
+.It Cm tunneldomain Ar rdomain
+Set the routing table the tunnel traffic operates in.
+The routing table may only be configured while the interface is down.
+.It Cm tunnelttl Ar ttl
+Set the Time-To-Live field in IPv4 encapsulation headers, or the
+Hop Limit field in IPv6 encapsulation headers.
+.It Cm tunneldf
+Disable fragmentation of tunnel traffic by the interface.
+This sets the Don't Fragment (DF) bit on IPv4 packets,
+and disables fragmentation of IPv6 packets.
+.It Fl Ns Cm tunneldf
+Allow fragmentation of tunnel traffic.
+.\" This clears the Don't Fragment (DF) bit on IPv4 packets,
+.\" and allows fragmentation of IPv6 packets.
+.It Cm rxprio Ar prio
+Configure how the interface sets the priority of incoming packets.
+.Ar packet
+maintains the existing priority of the packet.
+Priority may be hardcoded with a number from 0 to 7.
+.Ar outer
+uses the Type of Service field in IPv4 encapsulation headers, or
+the Traffic Class field in IPv6 encapsulation headers to set the
+packet priority.
+.It Cm txprio Ar prio
+Configure which value is used in the Type of Service field in IPv4
+encapsulation headers, or the Traffic Class field in IPv6 encapsulation
+headers.
+Values may be hardcoded with a number from 0 to 7, or
+.Ar packet
+to specify that the current priority of a packet should be used.
+.It Cm keepalive Ar period count
+Enable the transmission of keepalive packets to detect tunnel failure.
+Keepalives may only be configured while the interface is down.
+.It Fl Ns Cm keepalive
+Disable the transmission of keepalive packets to detect tunnel failure.
+Keepalives may only be disabled while the interface is down.
+.El
 .Ss Programming Interface
 .Nm
 interfaces support the following
 .Xr ioctl 2
 calls for configuring tunnel options:
-.Bl -tag -width indent -offset 3n
+.Bl -tag -width indent
 .It Dv SIOCSLIFPHYADDR Fa "struct if_laddrreq *"
 Set the unicast IPv4 or IPv6 addresses for the encapsulating IP packets.
 The addresses may only be configured while the interface is down.
@@ -101,7 +157,7 @@ The addresses may only be cleared while 
 Configure a virtual network identifier for use as the Tunnel Identifier.
 The virtual network identifier may only be configured while the
 interface is down.
-The Tunnel Identifier is a 16-bit value.
+The Tunnel Identifier is a 16-bit value between 0 and 65535 inclusive.
 .It Dv SIOCGVNETID Fa "struct ifreq *"
 Get the virtual network identifer used in the GRE Key header.
 .It Dv SIOCSLIFPHYRTABLE Fa "struct ifreq *"
@@ -173,6 +229,7 @@ On Host A
 # route add default B
 # ifconfig eoipN create
 # ifconfig eoipN tunnel A D
+# ifconfig eoipN vnetid T
 # ifconfig eoipN up
 # route add E D
 .Ed
@@ -181,7 +238,7 @@ On Host D (MikroTik):
 .Bd -literal -offset indent
 [admin@MikroTik] > interface eoip
 [admin@MikroTik] /interface eoip> add name="eoipN" \e
-\e... local-address=D remote-address=A
+\e... tunnel-id=T local-address=D remote-address=A
 [admin@MikroTik] /interface eoip> enable eoipN
 .Ed
 .Sh SEE ALSO