Cherry-pick PPP DNS fixes from PR 3181#3064

Merged

rlubos merged 2 commits intonrfconnect:mainfrom

SeppoTakalo:upstream_ppp_dns

Jul 28, 2025

Commits on Jul 25, 2025

[nrf fromtree] net: ppp: ipcp: Don't request DNS if not needed
SeppoTakalo
committed
[nrf fromtree] net: ppp: Allow peer-options to be rejected
SeppoTakalo
committed