How to make a binary UDP respond packet ?

the typical create a binary format UDP packet is through binary format command:

 

here a example:

 

 

set ::header_without_id [binary format S5 {0x8180 0x0001 0x0001 0x0000 0x0000}]

 

 

this mean format a binary format packet with 5 word. the follow in {} is the value of them. It's very simple, if you use "a5" replace "S5" that means format a packet with 5 char. but you should use value like 0x81 in the follow section. Also, an "a5S5" will be accepted option.

 

 

so the sample about 0xC080 packet construction should be:

 

 

when CLIENT_ACCEPTED {

 

set packet [binary format S {0xC080}]

 

UDP::response $packet

 

}

 

 

so BIGIP will reply 0xC080 for any UDP packet send to BIGIP.

 

 

for detail information, you can find the book of TCL about binary format.