IPv6 deployment at Oslo and Akershus University College of Applied Sciences (HiOA)

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1 IPv6 deployment at Oslo and Akershus University College of Applied Sciences (HiOA) GN3 Campus Workshop 2012 The last IPv6 workshop? Harald Terkelsen

2 Overview About Oslo and Akershus University College of Applied Sciences (Høgskolen i Oslo and Akershus - HiOA) History and status of IPv6 at HiOA Configuration and addresses Challenges and problems Wireless CPU utilization on the router other

3 About HiOA Merger of the former Oslo University College and Akershus University College in 2011 Two main campuses: Pilestredet in Oslo Kjeller in Akershus students 1600 employees

4 IPv6 timeline at HiOA January 2001 First request for IPv6 from department of engineering Request forwarded to Uninett June :700:700::/48 prefix is assigned A PC running Linux installed as IPv6 router Enabled on two network segments Sendmail is the first service with IPv6 LDAP, IMAP, some WEB servers and SSH follows later February 2004 Most network segments in Pilestredet have IPv6 enabled. Still few clients with IPv6 enabled and no wireless IPv6

5 IPv6 timeline at HiOA August 2006 IPv6 on the wireless network January 2007 Routing moved to Cisco Catalyst 6500 Sup 720 February 2010 Whitelisted to receive AAAA records from Google Windows 7 deployed with IPv6 enabled Internal file servers get IPv6

6 Status today ~200 static IPv6 addresses in DNS SMTP, IMAP, Samba file servers, many web applications, SQL, parts of Windows infrastructure, Exchange using load balancers No IPv6 only services, yet ~10000 hosts in the network ~75 percent of hosts IPv6 enabled

7 Host configuration Tunnel protocols, privacy extension and randomized address disabled on managed hosts Servers mostly use static addressing. SLAAC is disabled on new server installations Client subnets use SLAAC Supported on all platforms Stateless DHCPv6 for DNS information IPv6 firewall

8 Host configuration Why not statefull DHCPv6? Enabled by default only on Windows 7 when we looked at it (and Vista?) Still not enabled by default on all platforms? RA configuration still needed for default gateway Tested DHCPv6 and SLAAC enabled at the same time SLAAC with privacy extension was preferred for outbound traffic Have not tested lately with current OS versions Will probably look at DHCPv6 again later

9 Address plan We started before there were many recommendations Really simple: increment the prefix number for each new VLAN or network. One exception: A part of the prefix set aside for internal networks. Only /64 Static addresses inherit their last IPv4 octet Will look into a more practical IPv6 address plan when enabling IPv6 at campus Kjeller and to use when implementing a new network and security architecture.

10 Resources Initial deployment was done by one person 2-3 persons involved in managing it part time when needed Day to day administration takes little time Known preferred configuration is easy for administrators to deploy Training, finding preferred configuration and debugging problems can take time

11 Wireless Installed a Cisco wireless controller summer 2010 AAA override with IPv6 enabled did not work IPv6 prefix always from default VLAN Disable IPv6 or use without AAA override Supported in 7.2 released march 2012 on WISM2/WLC No fix for WISM 1! Had to enable RA throttling to get IPv6 address because of a configuration problem Receives incorrect RA from WLAN s default VLAN when reauthenticating using cached credentials after roaming. Assigned VLAN and solicited RAs still correct after roaming. Result: client configured an extra IPv6 address belonging in another network segment Confirmed by Cisco. Fix in progress.

12 Wireless Configuration problem: RA throttle Receive solicited RA Receive unsolicited RA Disabled (default) NO NO Enabled YES NO Cause: Multicast configured as multicast and APs unable to join IPv4 multicast group because of an IPv4 ACL on the router interface of the APs management VLAN blocking multicast But why do we see solicited RAs with RA throttling enabled? Cisco: RA throttle converts solicited RA to unicast Conclusion: AAA override does not currently work well when RA throttling is enabled. Make sure IPv4 multicast works for AP to controller communication or configure multicast as unicast on controller.

13 Router CPU utilization All campus VLANs routed on a Cisco Catalyst 6500 Supervisor 720 Many IPv6 functions are software processed Cisco document ID:63992: Catalyst 6500/6000 Switch high CPU Utilization August 2011: IPv6 unicast reverse path forwarding Solution : disable IPv6 URPF August 2012: IPv6 ND (40%) and IPv6 INPUT (20%) Solution: Upgrade IOS and tune IPv6 ND 12.2(33)SXI7: Enhanced IPv6 Neighbor Discovery cache management

14 Router CPU utilization Configuration changes that reduced the IPv6 ND and IPv6 INPUT CPU usage: Configuration ipv6 nd reachable-time ipv6 nd na glean Default value Advertise 0, uses itself Disabled ipv6 nd cache expire From a Cisco example. Probably needs more tuning.

15 Other challenges Windows servers on IPv4 only networks register their 6to4 address in dyndns. Train administrators and manage the servers 6to4 traffic on networks with native IPv6 Firewalls on unmanaged student clients? IPv6 traffic to internal DNS servers from external Teredo relays We suspect clients moving from our network without rebooting keeps IPv6 DNS resolvers on new IPv4-only network Discovered recently, needs more investigation Sites with IPv6 internally but no route to the Internet see our AAAA records Sites testing IPv6 on web servers serving different pages for IPv6 and IPv4

16 Summary of experiences We started early and small scale, got experience! The experience makes it easier to quickly understand new problems today Most basic services work well if properly configured Don t be surprised if not all IPv4 functionality is implemented for IPv6 in network systems Tuning may be needed with large ND tables Teredo and 6to4 is problematic

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