IX10 - TACACS+ Source interface

I have an IX10 with IPSec VPN conneted to hub.
I would like to have tacacs+ to use ETH interface as source, and access the central TACACAS-server via the IPsec tunnel

Is this possible using the IX10 platform?

Nov 1 13:27:38 ADK012 kernel: DROP (filter): IN=wwan0.1 OUT= MAC= SRC=91.240.118.75 DST=213.237.54.242 LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=7079 PROTO=TCP SPT=44900 DPT=3413 WINDOW=1024 RES=0x00 SYN URGP=0
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: 1 servers defined
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: server[0] { addr=10.208.76.24:49 }
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: tac_service=‘cli’
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: tac_protocol=‘unknown’
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: tac_prompt=‘’
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: tac_login=‘pap’
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: tac_groupname=‘’
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: _pam_account: [start] called (pam_tacplus v1.3.8)
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: _pam_account: tac_srv_no=1
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: _pam_account: username [xxxxx] obtained
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: _pam_account: tty [pts/3] obtained
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: _pam_account: rhost [unknown] obtained
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: tac_connect_single: connection failed with 10.208.76.24:49: Socket not connected
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: _pam_account: error sending start (fd)
Nov 1 13:27:39 ADK012 PAM-tacplus[13805]: pam_acc(cli:session): pam_acc: pam_sm_open_session

/Hallur