# IPv6 via 6rd on Charter with Cisco IOS

*June 28, 2014* — https://jade.wtf/tech-notes/charter-6rd-cisco-ios/

Tags: Cisco, IPv6, Charter

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Charter does not yet offer native IPv6 but they do have IPv6 via 6rd tunnels for testing. It mostly works but I've seen some weirdness with various v6 destinations. Thumbnail images breaking on Facebook periodically and things like that.

## Cisco IOS Configuration

I have this working on a Cisco 881W running IOS 15.3(2)T with the advsecurity license.

Enable IPv6:

	ipv6 unicast-routing
	ipv6 cef

Set up a DHCPv6 pool:

	ipv6 dhcp pool home-pool
	 dns-server 2607:F428:1::5353:1
	 dns-server 2607:F428:2::5353:1
	 domain-name home.example.com

Tunnel interface:

	interface Tunnel0
 	no ip address
	no ip redirects
 	ipv6 enable
	 tunnel source FastEthernet4
	 tunnel mode ipv6ip 6rd
	 tunnel 6rd prefix 2602:100::/32
	 tunnel 6rd br 68.114.165.1

Routes & general-prefix:

	ipv6 general-prefix DELEGATED_PREFIX 6rd Tunnel0
	ipv6 route 2602:100::/32 Tunnel0
	ipv6 route ::/0 Tunnel0 2602:100:4472:A501::1

LAN interface:

	interface Vlan1	
		ipv6 address DELEGATED_PREFIX ::1/64
		ipv6 nd other-config-flag
		ipv6 dhcp server home-pool

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© 2014 Jade Angrboða.