Networking

Fedora networking is done with the following components:

• Kernel
• GLIBC
• NetworkManager
• ISC DHCP

Networking bugs

Only platform bugs that can influence various application and/or the overall behavior of the system belong here.

IPv4

• getaddrinfo("127.0.0.1", ...) fail with some AI_ADDRCONFIG configurations
• dhclient fails with large values of dhcp-renawal-time, notably the infinity (0xffffffff) value

IPv6

• Fedora 808147 - getaddrinfo("::1", ...) fails with some configurations of AI_ADDRCONFIG
• getaddrinfo("fe80::1234:56ff:fe78:90%eth0", ...) also fails as above
• GLIBC's nsswitch doesn't support overriding getaddrinfo which is requred to resolve link-local IPv6 addresses
• Avahi's nss-mdns returns link-local IPv6 addresses without scope_id and applications fail to connect
• Avahi's IPv6 support is disabled by default (this has been resolved in the past)
• Various bugs in NetworkManager's IPv6 support

• Kernel ignores router preference!!!
• Inconvenience: ping doesn't support IPv6 (you have to use ping6)
• Tempaddr cycling breaks even TCP connections prematurely

DNS

• getaddrinfo doesn't support SRV records

Mobile Broadband

• NetworkManager: Mobile Broadband must be re-enabled after every boot or resume, and after a lost connection.
• NetworkManager: Fails to auto-connect to registered 3G network