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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 [email protected]
• http://bart.ns.gatech.edu/cw