how to send DHCP next-server attribute with IPoE configuration ?

[vstarlife]

Hi,

We are trying to send DHCP next-server attribute with IPoE configuration and radius. Seems that the SERVER-IP (next-server) is not forwarded to DHCP customers.

The following attributes are correctly send to customers:
DHCP-Root-Path = "A.B.C.D:/srv/tftp/os/pfsense/content/",
DHCP-Boot-File-Name = "lpxelinux.0",

But next-server is not modified and the client try to connect directly to accel-ppp server. We tried the following attributes:
DHCP-TFTP-Server-Name = A.B.C.D,
DHCP-Server-IP-Address = A.B.C.D,
DHCP-TFTP-Server-IP-Address = A.B.C.D,
DHCP-DHCP-Server-Identifier = A.B.C.D

Here's what we can see with tcpdump:
Client-IP X.X.X.X
Your-IP X.X.X.X
Client-Ethernet-Address 00:50:56:bf:3d:5d
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message (53), length 1: ACK
Server-ID (54), length 4: 198.18.1.61
Lease-Time (51), length 4: 60
RN (58), length 4: 30
RB (59), length 4: 52
Default-Gateway (3), length 4: 198.18.1.61
Subnet-Mask (1), length 4: 255.255.255.255
RP (17), length 41: "A.B.C.D:/srv/tftp/os/pfsense/content/"
BF (67), length 11: "lpxelinux.0"
TFTP (66), length 11: "A.B.C.D"
Domain-Name-Server (6), length 4: 1.1.1.1

WIth a standard DHCP server, there is the "SERVER-IP" attribute which is correctly configure with next-server.

Did we miss something ?