How to check if a string parameter can be an IPv4 or an IPv6 or nothing in an iRule ?

Question

How to deal with that question in the best optimized way to code it versus cycles ?

"How to check if a string parameter can be an IPv4 or an IPv6 or nothing in an iRule ?"

I have already looked at "IP::addr .... mask ...scan ..." without any simple efficient way.

Some helps ? Some few lines ? or TCL function or undocumentated iRule command ?

Many thanks :-)

petewhite · Answer

string matching with ip addresses is a bit wonky but you could simply do this:if { $string equals "" } {
# Empty string
} elseif { $string contains "." } {
# IPv4
} elseif { $string contains ":" } {
# IPv6
} else {
# error
}

rodolphe_aubin1 · Answer

Thank you Pete but a little bit too simple and too light 😉

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How to check if a string parameter can be an IPv4 or an IPv6 or nothing in an iRule ?

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