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maskreply(ADMN)


maskreply -- send gratuitous ICMP mask reply

Syntax

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. By executing maskreply in /etc/tcp this requirement is satisfied.

See also

icmp(ADMP), ifconfig(ADMN), ip(ADMP), tcp(ADMN)

Standards conformance

maskreply is conformant with:

RFC 792 (STD 5), RFC 1122 (STD 5)


© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003