Things to note regarding the Looking Glass are as follows ;

• There are 2 separate routers performing Looking Glass functions :

 The Domestic Looking Glass router includes BGP routes for Optus Customers , Optus Internal , and National Peers only.
 The International Looking Glass router includes BGP routes for Optus Customers , Optus Internal , and International Peers only

• Important BGP Communities configured by Optus include the following :

 BGP Community 7474:1402 is used for Asian Routes
 BGP Community 7474:1403 is used for US Routes
 BGP Community 7474:1202 is used for NSW Customer Routes
 BGP Community 7474:1203 is used for VIC Customer Routes
 BGP Community 7474:1204 is used for QLD Customer Routes
 BGP Community 7474:1205 is used for SA Customer Routes
 BGP Community 7474:1206 is used for WA Customer Routes
 
 Customers can also override BGP Local Preference in AS7474 by announcing the following BGP Communities with their routes -
 
 BGP Community 7474:100 is used for Customer routes to set BGP Local Preference to 100 (the default Local Preference for customer routes)
 BGP Community 7474:90 is used for Customer routes to set BGP Local Preference to 90
 BGP Community 7474:80 is used for Customer routes to set BGP Local Preference to 80
 BGP Community 7474:70 is used for Customer routes to set BGP Local Preference to 70

• These Routers do not have links into each Optus Router. They consist of simply a Ethernet interface to plug it into the network. As such, ping's & trace's will always take the same path. Ping's and trace's are only really useful for verifying IP connectivity to a host, and do not demonstrate accurately the path the packets will take from other routers in our network.
• RADB requests are done realtime by opening a port 43 connection to whois.radb.net and are not results from a local cached database or similar.
• nslookup, dig and all other DNS resolution is done off a DNS resolver at 202.139.124.225 where no domains are hosted (caching-only nameserver).