Berkeley CSUA MOTD:Entry 27319
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2025/07/08 [General] UID:1000 Activity:popular
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2003/2/6-7 [Computer/Networking] UID:27319 Activity:high
2/5     Does anyone know which RFC (if any) has a list of ip addr
        blocks that are considered invalid, (ex. 169.254.0.0/16)?
        1918 only lists the private blocks. tia.
        \_ 169.254/16 is used by dhcp autoconfig... essentially if you have
           an ip network w/o a dhcp server and don't want to manually config
           you ip int. it's similar to how ipx and appletalk config w/o a
           seed router. -shac
        \_ Well first explain what you mean by 'considered invalid' and maybe
           we can find you your list.
                \_ By invalid I mean pkts with src/dest addrs that are
                   in addr blocks which should never send traffic on the
                   internet. I'm trying to filter pkts with invalid ip
                   addr (spoofed pkts) and I wanted to know if there were
                   addr blocks other than the RFC 1918 private blocks
                   that I should be filtering. So far, I've just found
                   the 169.254.0.0/16 addr block which is used for dhcp
                   client auto-conf. I wanted to know if there were others.
                   \_ by 'should never' do you mean addr's that aren't
                      registered, or just addressees that aren't routable
           10.0.0.0/8, 127.0.0.0/8, 169.254.0.0/16, 172.16.0.0/12, 192.0.2.0/24,
           192.168.0.0/16, 224.0.0.0/4, 240.0.0.0/4 (These last two are
           contiguous.) --scotsman
                      ( which changes regularly -- get a BGP feed from
                      somewhere if you really want a list).
        \_ i don't remember the exact page, but it's somewhere on http://ietf.org
           and it goes like this:
           10.0.0.0/8, 127.0.0.0/8, 169.254.0.0/16, 172.16.0.0/12,
           192.0.2.0/24, 192.168.0.0/16, 224.0.0.0/4, 240.0.0.0/4
           (These last two are contiguous.) --scotsman
           \_ Thanks. I'll search on http://ietf.org to see if there are
              others. BTW, do you know what the 192.0.2.0/24 block
              is used for?
              \_ It's used for examples (a la http://example.com, or the 555
                 telephone prefix) --scotsman
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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