https://wiki.vasexperts.com/ 2026-04-15T05:38:07+00:00 https://wiki.vasexperts.com/ https://wiki.vasexperts.com/lib/tpl/vaswiki/images/favicon.ico text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:bras_l2_vlan_qinqtype&rev=1776182410&do=diff Double VLAN EtherType When the heterogeneous traffic 1 VLAN -> 2 VLAN (QinQ) is interconnected or when the WAN->LAN traffic is originated there is an ambiguity, i.e. what EtherType to be used within the L2 QinQ tag. There are used several EtherType for a double VLAN: text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:bras_l2_vlan_term_as&rev=1776182410&do=diff Termination at the autonomous system (AS) level Starting from the VAS Experts DPI version 7.4 the traffic termination feature applicable only for explicitly specified AS is added. To enable this feature you need to specify following option in fastdpi.conf text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:bras_l2_vlan_term_cut&rev=1776182410&do=diff Native VLAN termination The FastDPI BRAS operating in the native termination mode (bras_vlan_terminate=1) removes all the VLAN tags from the outgoing packets (LAN -> WAN) and inserts VLAN tags in the incoming packets (WAN->LAN). The VLAN tags are extracted from the destination IP address (from the UDR internal database) when traffic is originated. text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:bras_l2_vlan_term_dna&rev=1776182410&do=diff Setting the termination parameters for each output DPDK interface In the VAS Experts DPI 7.4+ a new feature to specify termination parameters for each output DPDK interface on your own is added. The bras_term_dev_outer option is used for this purpose: text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:bras_l2_vlan_term_trans&rev=1776182410&do=diff VLAN tags transformation Starting from the Stingray Service Gateway version 7.4 the new feature of VLAN tags transformation is added. Transformation mode is very similar to the Substitution mode, but in this case the number of VLAN tags within the subscriber packet may differ from the number specified in the text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:bras_l2_vlan_term_zero&rev=1776182410&do=diff VLAN tags substitution The BRAS native termination mode can be quite resource-consuming for the fastDPI. The fact is that the fastDPI is optimized primarily for the packets filtering, rather than for modifying them, especially if these modifications cause the packets size changing. The required copying of the packet content which occurs when deleting/adding VLAN tags can significantly reduce the fastDPI performance by 25-30%. text/html 2026-04-14T16:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.vasexperts.com/doku.php?id=dpi:bras_bng:bras_l2_vlan_term:ttl&rev=1776182410&do=diff TTL By default, Stingray Service Gateway in L2 BRAS mode does not change TTL packets, that is, it is transparent for utilities, such as traceroute. This is not always convenient: for example, the subscriber will not see his subscriber gateway in the output of the traceroute command.