AAPT Home > Permanent Connections > L2tp Multihop

Overview

AAPT offers mutiple products which use L2TP Multihop to aggregate customer PPP sessions for termination on CPEs.

This page is intended for customers of these services to have a basic overview of the configuration required.

Cisco router configuration

There are basic steps to configure these routers, they are:

 - Enable VPDN on your router
 - Configure an "accept-dialin" vpdn-group
 - Configure a Virtual-Template
 - Configure a Local pool
 - Configuration of Radius
 - Routing configuration (See next section)
 

vpdn enable
vpdn multihop
vpdn logging
vpdn logging local
vpdn logging tunnel-drop
vpdn history failure table-size 50
vpdn search-order domain
vpdn domain-delimiter @ suffix
vpdn domain-delimiter / prefix
!
vpdn-group aapt-dsl
 accept-dialin
  protocol l2tp
  virtual-template 1
 source-ip [IP which we terminate your sessions on]
 lcp renegotiation on-mismatch
 l2tp tunnel password [L2TP Negotiated Password]
 ip mtu adjust
!
interface Virtual-Template1
 ip unnumbered Loopback0
 ip tcp adjust-mss 1360
 peer default ip address pool default
 ppp mtu adaptive
 ppp authentication pap chap
!
radius-server host [Your radius server ip] auth-port 1645 acct-port 1646
radius-server retransmit 1
radius-server timeout 12
radius-server deadtime 1
radius-server key [Radius Shared Secret]
!
ip local pool default [start ip] [end ip]

Routing information

With a standard router, which doesn't do L2TP termination, generally a simple Default route will suffice. As AAPT generally provide your L2TP termination down 
a dedicated link, you will need to ensure that only our LNS routes are pointed out your L2TP link, and that your default route is destined down your Internet Link. 

There are 3 methods of doing this: 
 - Route specific /24's which contain AAPT Loopbacks only (May interfere in some routing, as it is not specifically only LNS Loopbacks- May also become out of date)
 - Continually maintain a list of /32 loopback IPs to our LNS's (May become out of date)
 - Configure a BGP feed, which will advertise only 2764:65414 addresses. (Needs some LNS configuration, aswell as a BGP setup)

Routing of /24's which contain our LNS Loopback ips:

ip route 203.63.80.0 255.255.255.0 [AAPT end of L2TP link]
ip route 210.8.1.0 255.255.255.0  [AAPT end of L2TP link]
ip route 210.9.191.0 255.255.255.0  [AAPT end of L2TP link]

Routing of current L2TP loopback IPS:

ip route 203.63.80.93 255.255.255.255 [AAPT end of L2TP link]
ip route 203.63.80.133 255.255.255.255 [AAPT end of L2TP link]
ip route 203.63.80.134 255.255.255.255 [AAPT end of L2TP link]
ip route 203.63.80.137 255.255.255.255 [AAPT end of L2TP link]
ip route 203.63.80.239 255.255.255.255 [AAPT end of L2TP link]
ip route 203.63.80.150 255.255.255.255 [AAPT end of L2TP link]
ip route 203.63.80.151 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.12 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.16 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.19 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.20 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.21 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.31 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.65 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.67 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.68 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.73 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.76 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.77 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.78 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.79 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.80 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.85 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.86 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.97 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.99 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.105 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.106 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.107 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.108 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.129 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.130 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.136 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.161 255.255.255.255 [AAPT end of L2TP link]
ip route 210.8.1.202 255.255.255.255 [AAPT end of L2TP link]
ip route 210.9.191.71 255.255.255.255 [AAPT end of L2TP link]
ip route 210.9.191.73 255.255.255.255 [AAPT end of L2TP link]
ip route 210.9.191.74 255.255.255.255 [AAPT end of L2TP link]
ip route 210.9.191.78 255.255.255.255 [AAPT end of L2TP link]
ip route 210.9.191.79 255.255.255.255 [AAPT end of L2TP link]

BGP setup

To use this, you must already have an AS number. If not, you are able to apply to your Account Manager for a Private AS (This may attract a fee)

- Enable BGP peering on your link on our webpage
- Select "LNS L2TP source IP addresses"  with no defaults or communities
- Configure your router with the new bgp feed: 

router bgp [AS number]
 neighbor [AAPT Peer IP] remote-as 2764
 neighbor [AAPT Peer IP] route-map AS2764-LNS-EXPORT out
 neighbor [AAPT Peer IP] maximum-prefix 200 50
! 
!  
 route-map AS2764-LNS-EXPORT deny 10

Current list of LNSs' as of 26/08/08

ADSL LNS
VIC	
bur-cor6   210.8.1.18
mel-cor8   203.63.80.133 (To be decommision on 25/9/08)
mel-cor9   203.63.80.134 (To be decommision on 25/9/08)
mel-cor11  203.63.80.137 (To be decommision on 25/9/08)
MELFBRAS08 203.63.80.133 (replacing mel-cor8,9 and 11 on 25/9/08)

NSW	
hay-cor15  210.9.191.97 (To be decommision on 11/9/08)
syd-cor13  203.63.80.152
SYDCBRAS08 210.9.191.97 (replacing hay-cor15 on 11/9/08)

QLD	
for-cor1   203.63.80.254
BRIQBRAS08 210.8.1.77

ACT	
can-cor3   210.8.1.161

TAS	
hob-cor2   203.63.80.93

SA	
ade-cor4   210.8.1.129
ade-cor6   210.8.1.130
ade-cor7   210.8.1.136

NT	
ade-cor4   210.8.1.129
ade-cor6   210.8.1.130
ade-cor7   210.8.1.136

WA	
per-cor3   210.8.1.97
per-cor6   210.8.1.99
per-cor7   210.8.1.105
per-cor8   210.8.1.106
per-cor9   210.8.1.107
per-cor10  210.8.1.108



Dial LNS

VIC	
bur-cor5   210.8.1.12
mel-cor12  203.63.80.140

NSW	
hay-cor7   210.9.191.71
hay-cor9   210.9.191.73
hay-cor14  210.9.191.79

QLD	
for-cor3   210.8.1.65
for-cor7   210.8.1.76

ACT	
hay-cor7   210.9.191.71
hay-cor9   210.9.191.73
hay-cor14  210.9.191.79

TAS	
bur-cor5   210.8.1.12
mel-cor12  203.63.80.140

SA	
ade-cor6   210.8.1.130
ade-cor7   210.8.1.136

NT	
ade-cor6   210.8.1.130

WA	
per-cor6   210.8.1.99
per-cor7   210.8.1.105
per-cor8   210.8.1.106