Campus Case Studies in Implementing Advanced Services

Cas D’AngeloCas.DAngelo@oit.gatech.edu

Preparing for Advanced Services

• Gigabit ethernet migration

• Gateway routers

• Performance testing TCP tuning

• Multicast

• Security

Gigabit ethernet migration

• Georgia Tech has installed 100+ ELANS

• Implemented as a standards based VLAN

• New standards such as 802.1q now available

Gigabit ethernet migration

• Gigabit ethernet - supports large MTU

• Wire speed routing

• Trying to go with IP only backbone

• Never routed IPX across backbone

• Appletalk is the next protocol to be eliminated

Gigabit ethernet migration

• Building design moving from ATM attached ethernet switches to Gigabit ethernet attached 10/100 switches

Gateway routers

• Redundant routers

SoX

Internet 1

PeachNet

ATM OC-12ATM OC-12

Gigabit EthernetGigabit Ethernet

Backbone (other campus routers)

Gateway 1Router

Gateway 2Router

Gateway routers

• OSPF load balancing for backbone

• Packets alternate between routers

• Both advertise default route originate

Gateway routers

• BGP used to control ISP traffic

• Prefer SoX routes

• AS padding for Internet 1 traffic

• Arrangement with SoX to support large MTU

Performance testing - TCP tuning

• Iperf: http://dast.nlanr.net/Projects/Iperf/ Tools for experimenting with bandwidth throughput and adjusting TCP window sizes

• Nettest: http://www-itg.lbl.gov/nettest/ A secure, real-time network monitoring framework which includes Iperf

Performance testing - TCP tuning

• Autobuf: http://dast.nlanr.net/Features/Autobuf_v1.0/An auto tuning-enabled FTP client and server

Multicast

• Vendors still working out problems

• Multivendor interoperability leaves finger pointing problems

• Within last few months have fought with mbgp community issue

• Great tool: Access Grid + Multicast Beaconhttp://dast.nlanr.net/Projects/Beacon/

Security

• Border data - Tracking flows at egress to campus

• Research machines are target for DOS, must be made secure

• Firewalls are being installed to ease system administration and for contracts

Questions

• Cas D’Angelo, Network ManagerGeorgia Institute of TechnologyOffice of Information TechnologyCas.DAngelo@oit.gatech.edu

• http://bart.ns.gatech.edu/cw