maskreply(1Mtcp)
maskreply --
send gratuitous ICMP mask reply
Synopsis
maskreply
Description
maskreply checks the kernel variable
icmp_answermask; if it is set, then for each
interface maskreply sends an unsolicited
ICMP netmask reply to the address returned by
SIOCGIFBRDADDR using the netmask returned by
SIOCGIFNETMASK. maskreply will send a
mask reply out an interface only if all of the following
are true: the interface is in address family
AF_INET, the interface is up, the interface
supports broadcasts, and the interface is not
point-to-point.
A host that acts as an authority for netmasks is required
by RFC 1122 to broadcast an ICMP
subnetmask reply when the host comes up. This requirement
can be satisfied by executing maskreply in
/etc/inet/config.
References
config(4tcp),
icmp(7tcp),
ifconfig(1Mtcp),
ip(7tcp)
RFC 792, RFC 1122
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004