[Cerowrt-devel] Link layer adaptation VDSL2 - Basis for 8 byte overhead?

[Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>]

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Hi,

Enquiring mind here :-)  Reading http://www.bufferbloat.net/projects/cerowrt/wiki/Everything_you_wanted_to_know_about_Link_Layer_Adaptation and the linked to email discussion, I'm curious as to where the 8 byte overhead recommendation for VDSL2 comes from.  Is this assumption that PPPoE is being used?  Based on that assumption it raises further questions in my mind:

My ISP supplier (Sky in the UK) provide straight ethernet over PTM, with DHCP to obtain a public IP address, so in theory no PPPoE overhead unlike other ISPs offering 'fibre' (ha!) broadband in the UK.  There appears to be a tagged VLAN on the WAN port, therefore I think the correct overhead in my case is 4 (VLAN) and for everyone else it should be 12 (VLAN + PPPoE)

Please correct my assumptions :-)

Kevin

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Thanks,

Kevin@Darbyshire-Bryant.me.uk



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