Frequently Asked Questions

Outer VLAN header not captured in PCAP?

Some interface drivers drop the outer VLAN header. The BNG Blaster tries to recover the VLAN from kernel headers but will not change the packets stored in the PCAP file.

Some sessions established on BNG are not established on BNG Blaster?

The BNG Blaster considers a session only as established if all configured protocols are established. This could occur if the device under test (your BNG) is configured for IPv4 only but the BNG Blaster is configured for IPv4 and IPv6.

The idea here is to prevent potential failures will be overseen.

DHCPv6 does not start for PPPoE sessions?

The BNG Blaster expects an ICMPv6 router-advertisement with an other-config flag before it starts sending DHCPv6 within a PPPoE session.

Why is stream length limited to 3936 bytes?

The stream length limit is dynamically calculated depending on the configured IO mode. The default mode using Packet MMAP limits the stream length to pagesize minus internal header and overhead (ethernet, MPLS, …) which results in 3936 bytes on most systems. The IO mode RAW would allow streams with up to 9000 bytes.