Для ipoe:
interface=client11,range=
172.19.11.0/24,ifcfg=1,start=dhcpv4,mode=L2,shared=1,proxy-arp=0,ipv6=1Jun 1 12:11:27 nas2 accel-ipoe: client11:: recv [DHCPv4 Discover xid=49a9a0a1 chaddr=ac:84:c6:83:bc:bd <Message-Type Discover> <Max-Message-Size 1024> <Client-ID 01ac84c683bcbd> <Host-Name TL-WR840N> <Vendor-Class 4d53465420352e30> <Request-List Subnet,Router,DNS,Domain-Name,Vendor-Specific,44,46,47,Route,Classless-Route,249>]
Jun 1 12:11:27 nas2 accel-ipoe: ipoe21:: create interface ipoe21 parent client11
Jun 1 12:11:27 nas2 accel-ipoe: ipoe21:: send [RADIUS(1) Access-Request id=1 <User-Name "ac:84:c6:83:bc:bd"> <NAS-Port 58857> <NAS-Port-Id "ipoe21"> <NAS-Port-Type Ethernet> <Calling-Station-Id "ac:84:c6:83:bc:bd"> <Called-Station-Id "client11"> <Acct-Session-Id "dfc94df57ee7ccb7"> <User-Password 0x2bba909f4d0fcfac20e035bfce0cf41297d3ed0cff809bdab48ddf510233cf72>]
Jun 1 12:11:27 nas2 accel-ipoe: ipoe21:: recv [RADIUS(1) Access-Accept id=1 <Acct-Interim-Interval 300> <Framed-IP-Address
185.123.187.200> <Filter-Id "101000/101000"> <Mikrotik-Address-List "allowed-clients">]
Jun 1 12:11:27 nas2 accel-ipoe: ipoe21:ac:84:c6:83:bc:bd: ac:84:c6:83:bc:bd: authentication succeeded
Jun 1 12:11:27 nas2 accel-ipoe: ipoe21:ac:84:c6:83:bc:bd: send [DHCPv4 Offer xid=49a9a0a1 yiaddr=
172.19.11.2 chaddr=ac:84:c6:83:bc:bd <Message-Type Offer> <Server-ID
172.19.11.1> <Lease-Time 600> <T1 300> <T2 525> <Router
172.19.11.1> <Subnet
255.255.255.0> <DNS
185.123.187.8,
185.53.72.12>]
Я так понимаю, ему не хватает ещё каких-то атрибутов.