DHCPoption 121 not working

RouterOS General
1

Hello,

When I use additional option, code 33 (Static Route Option http://www.rfc-archive.org/getrfc.php?rfc=2132), in my DHCP server everything work’s fine.

[admin@TT] ip dhcp-server option> pr
 # NAME                                CODE VALUE
 0 route                               33  0x0A0200010A010001

Meaning dst=10.2.0.1 goes through gateway 10.1.0.1

Problem is when I try code 121 (Classless Static Route Option http://www.rfc-archive.org/getrfc.php?rfc=3442). Windows clients do not add it in to its routing table.

[admin@TT] ip dhcp-server option> pr
 # NAME                                CODE VALUE
 0 route                               121  0x100A000A010001

Meaning dst=10.0.0.0/16 goes through gateway 10.1.0.1

Any clue?

Thank you

2

…Anyone… :confused:

3

Anyone, how work 121 option in DHCP?

4

If all your clients are Windows computers you can use DHCP option code 249 instead of 121 (this does work on my router with RouterOS 5.12).

Also a question to MikroTik - why DHCP option 121 isn’t pushed to clients? It is a bug or is this done intentionally?