that’s ok for me.
But I added 4 rules:
MARK all opt — in * out * 127.0.0.1 !-> 10.0.0.0/8 MARK set 0x64
MARK all opt — in * out * 10.252.253.254 !-> 10.0.0.0/8 MARK set 0x64
MARK all opt — in * out * 10.252.252.254 !-> 10.0.0.0/8 MARK set 0x64
MARK all opt — in * out * 10.252.251.254 !-> 10.0.0.0/8 MARK set 0x64
(all ip addresses are binded to this router)
The ddns client still use a random ppp link…