Evgeniy Sudyr <[email protected]> writes: > Hi, > > I want to change route preference for the default route in RA messages > which are sent to clients. > > On 5.9 GENERIC.MP#1888 amd64 I do have rtadvd and changing rtflags in > rtadvd.conf doesn't changes > > Default router Preference (it sends default value, where I define "l" = Low). > > In config I have just two items set: > > vlan6:\ > :raflags#64:\ > :rtflags="l": > > raflags#64 (Other stateful configuration flag bit) > rtflags="l" (Low route preference for the route)
I don't understand what "l" means here, rtadvd.conf(5) doesn't seem to mention this as a valid setting. > I'm always getting pref=medium for default router preference. > > $ ndp -rn > fe80::xxxx:xxxx:xxxx:5e0c%vlan0 if=vlan0, flags=O, pref=medium, expire=29m52s > > However It works perfect for non-default route preference for the > route, but not default e.g.: > > vlan6:\ > :raflags#64:rtflags="l":rtprefix="2001:1:1:1::":rtplen#64: > > It will be great if someone can share working config options which > allows to change DRFAULT router preference RA message value. As the rtflags description says, bits 4 and 3 are used to encode the preference. "low" is 0x18 / 24. :raflags#24: seems to do the trick here. Your mail points out three problems imo: - tcpdump doesn't show the preference - the documentation of raflags is lacking - it's a shame that raflags was used instead of a nicer config abstraction. I think :pref="low":managed#1: would be a bit easier than playing with... bits. -- jca | PGP : 0x1524E7EE / 5135 92C1 AD36 5293 2BDF DDCC 0DFA 74AE 1524 E7EE
