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Eddie Kohler edited this page Oct 17, 2017
·
1 revision
FixIPSrc Element Documentation
NAME
FixIPSrc — Click element;
sets IP source field if requested by annotation
SYNOPSIS
FixIPSrc(IPADDR)
Ports: 1 input, 1 output Processing: agnostic
DESCRIPTION
Expects an IP packet as input. If its Fix IP Source annotation is set, then
changes its IP source address field to IPADDR and recomputes the checksum.
Used by elements such as ICMPError that are required by standards to use
the IP address on the outgoing interface as the source. Such elements must
set ip_src to something reasonable in case the outgoing interface has no IP
address.
Also clears the Fix IP Source annotation.
NOTES
The Fix IP Source annotation is stored as user annotation 3.