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Semelhante a Ad-Hoc Networking in Linux with Avahi
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Ad-Hoc Networking in Linux with Avahi
- 1. Linux Ad-HOC Networking Home Networks are Fun Again Chris Gragsone [email_address] ERIS RESEARCH
- 6. Local-Link Architecture APPLICATION DISCOVERY NAMING APPLICATION TRANSPORT NETWORK DATA-LINK UPnP TCP/IP Local-Link Zeroconf DNS-SD mDNS APIPA UPnP APIPA SLP ADDRESSING SLP SSDP
- 9. Addressing Layer (Cont.) New host connects to the local network. Attempts a DHCP request No DHCP Sever present to respond. DHCP Request time out.
- 10. Addressing Layer (Cont.) New host connects to the local network. Attempts a DHCP request Another host on the network answers the ARP request. New host now knows that IP address is taken. Host selects a random IP address in the 169.254.0.0/16 range. Performs an ARP request
- 11. Addressing Layer (Cont.) New host connects to the local network. Attempts a DHCP request No one replies after multiple ARP requests. New host has assurances that the IP is available. Host selects a random IP address in the 169.254.0.0/16 range. Performs an ARP request Host selects a new IP address in the 169.254.0.0/16 range. Performs an ARP request for the new IP
- 12. Addressing Layer New host connects to the local network. Attempts a DHCP request Host selects a random IP address in the 169.254.0.0/16 range. Performs an ARP request Host selects a new IP address in the 169.254.0.0/16 range. Performs an ARP request for the new IP Host assigns itself the IP address. Begins answering ARP requests.
- 17. Naming Layer (Cont.) alice.laptop wants to know who charlie.mac is. alice.laptop doesn’t have a DNS server in its configuration. If alice.laptop was making a request to charlie.local, then normal DNS would automatically be skipped. alice.laptop sends a request to 224.0.0.251:5353 udp. While everyone on the network receives the request, only charlie.mac currently knows his address.
- 18. Naming Layer (Cont.) alice.laptop wants to know who charlie.mac is. alice.laptop doesn’t have a DNS server in its configuration. If alice.laptop was making a request to charlie.local, then normal DNS would automatically be skipped. alice.laptop sends a request to 224.0.0.251:5353 udp. While everyone on the network receives the request, only charlie.mac currently knows his address. Once charlie.mac replies to 224.0.0.251.5353 Then everyone else caches the responce
- 19. Naming Layer (Cont.) bob.laptop wants to know who charlie.mac is. bob.laptop sends a request to 224.0.0.251:5353 udp.
- 20. Naming Layer (Cont.) bob.laptop wants to know who charlie.mac is. bob.laptop sends a request to 224.0.0.251:5353 udp. Sadly, charlie.mac is currently rebooting
- 21. Naming Layer (Cont.) bob.laptop wants to know who charlie.mac is. bob.laptop sends a request to 224.0.0.251:5353 udp. Sadly, charlie.mac is currently rebooting Luckily, dave.pc has it stored in cache