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An example configuration of a Dual stack enabled router
In this article we will give the configuration used on the ASR 1004 and the switches used to provide the wireless and wired access to internet during the Fosdem 2011 conference.
During this conference we had more then 4171 unique users on the WiFi over the whole event, with a peak of 1672 concurrent users. Most of them using a dual stack to access the internet using IPv4 and IPv6 across a 1Gbps fiber link.
We had to redact some information as it would reveal information regarding the ULB, who was so kind as to allow us to use their wireless infrastructure, among other things.
We also owe a debt to our fantastic ISP: Belnet who provided the 1 Gbps link and a IPv4 and IPv6 network ranges.
Cisco also sponsored this event, providing hardware and volunteers to configure and maintain the network.
The configuration of the main router with comments and important commands in bold was:
------------------ show running-config ------------------
Current configuration : 13632 bytes
! Last configuration change at 13:52:55 UTC Sun Feb 6 2011 by admin
! NVRAM config last updated at 10:50:42 UTC Sun Feb 6 2011 by admin
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec localtime show-timezone
boot system flash bootflash:asr1000rp1-adventerprisek9.03.01.02.S.150-1.S2.bin
vrf definition Mgmt-intf
logging buffered 1048576
enable secret 4 <redacted>
aaa authentication login default local enable
aaa session-id common
no ip source-route
ip icmp rate-limit unreachable 100
! note we only limit the unreachables as we need icmp for ND and PMTU
! we have the AP in a different VRF
ip vrf ULB-AP
no ip bootp server
ip domain name fosdem.net
ip host core-sw 192.168.211.254
ip host noc-sw 192.168.211.253
ip host h-sw 192.168.211.252
ip host j-sw 192.168.211.251
ip host aw-sw 192.168.211.250
ip name-server 188.8.131.52
ip name-server 184.108.40.206
ip name-server 220.127.116.11
ip name-server 18.104.22.168
ip name-server 2001:6A8:3C80::20
ip dhcp database flash:/dhcp-database
ip dhcp bootp ignore
ip dhcp excluded-address 22.214.171.124 126.96.36.199
ip dhcp excluded-address 188.8.131.52 184.108.40.206
ip dhcp excluded-address 220.127.116.11 18.104.22.168
ip dhcp excluded-address 22.214.171.124 126.96.36.199