ISP Configurations

This page describes how to connect to networks of different commercial Internet service providers.

Deutsche Telekom


  • ATM
    • VPI (Virtual Path Identifier): 1
    • VCI (Virtual Channel Identifier): 32


The network protocols are layered in this way:

  1. VDSL link (17a profile, G.993.5 depending on the DSLAM)
  2. PTM (Packet Transfer Mode)
  3. Ethernet with VLAN 7 (data + voice)
  4. PPPoE
    1. For some resale accounts an “H” has to be added in front of the pppoe user name, for 1und1 it looks like this “H1und1/”

You global routed IPv4 address and a some IPv6 subnets

When the network supports VDSL vectoring, but the VDSL modem does not support it, the device will be put into a fall back mode using only the lower 2.2 MHz of the band, this results in reduced rates like 13 MBit/s down and 1.4 MBit/s up instead of 50 MBit/s. Details:

Example VDSL configuration for Lantiq based devices:

config dsl 'dsl'
	option annex 'a'
	option tone 'av'
	option xfer_mode 'ptm'

config interface 'wan'
	option proto 'pppoe'
	option _orig_ifname 'ptm0'
	option _orig_bridge 'false'
	option ifname 'ptm0.7'
	option username 'H1und1/'
	option password 'abcdefghijklm'
	option ipv6 'auto'