Hi there We use firebrick Routers as LNS routers and they have worked fine in the past. However I have a new requirement to proxy one realm (authentication and accounting) to a remote server for a customer. I have the auth side working find - and the account start packet. However the firebrick does not provide the username in interim updates or stop messages - which means that the proxy based on realm fails (the username / realm is not there). Is there a way using unlang to proxy these - I was looking at the lines in detail - we do also have the records in our SQL server and from the AcctSessionID I can look up the username which is possible I do have one other possibility. The Interim updates have a field: Chargeable-User-Identity = "XXXXX" Which I can set as part of the auth process (I already add some fields in post_proxy). Is there a way in FreeRadius to inspect this field in a accounting packet and if set to 'resellerx' set the packet to be sent to their proxy / home server ? The second I assume would be faster .... I have also emailed the router manufacturer to see if the username can be added easily in a software patch but that may take time ... An example current accounting packet is: Sun Nov 26 20:00:05 2017 Acct-Status-Type = Interim-Update Chargeable-User-Identity = "BBEU12345675" Event-Timestamp = "Nov 26 2017 20:00:00 GMT" Acct-Input-Octets = 7137840 Acct-Input-Gigawords = 0 Acct-Output-Octets = 487340050 Acct-Output-Gigawords = 0 Acct-Session-Time = 576 Acct-Input-Packets = 99535 Acct-Output-Packets = 342237 Tunnel-Client-Endpoint:0 = "ADSL" NAS-Identifier = "aglovale.merula.net" Acct-Session-Id = "S600000269717072AECC00" NAS-IP-Address = 1.2.3.4 NAS-Port = 697 Connect-Info = "39550000/1000000000" Acct-Unique-Session-Id = "c89cbc69ab30d4afaff763c46057b04e" Timestamp = 1511726405 I would be grateful for any suggestions Richard