Date: Thu, 12 Mar 2015 22:59:33 -0400 From: "Matt Emmerton" <matt@gsicomp.on.ca> To: <mail@leha.info>, <freebsd-questions@FreeBSD.org> Subject: RE: there is a mistake in ipfw docs on your site Message-ID: <002e01d05d39$bbcbf790$3363e6b0$@on.ca> In-Reply-To: <55024880.7080709@leha.info> References: <55024880.7080709@leha.info>
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-----Original Message----- From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-questions@freebsd.org] On Behalf Of ??????? ???? Sent: Thursday, March 12, 2015 10:17 PM To: freebsd-questions@FreeBSD.org Subject: there is a mistake in ipfw docs on your site hello talking about this page: https://www.freebsd.org/doc/en/books/handbook/firewalls-ipfw.html there's RFC (http://www.rfc-editor.org/rfc/rfc5735.txt), which says: 4. Summary Table Address Block Present Use Reference ------------------------------------------------------------------ 0.0.0.0/8 "This" Network RFC 1122, Section 3.2.1.3 10.0.0.0/8 Private-Use Networks RFC 1918 127.0.0.0/8 Loopback RFC 1122, Section 3.2.1.3 169.254.0.0/16 Link Local RFC 3927 172.16.0.0/12 Private-Use Networks RFC 1918 192.0.0.0/24 IETF Protocol Assignments RFC 5736 192.0.2.0/24 TEST-NET-1 RFC 5737 192.88.99.0/24 6to4 Relay Anycast RFC 3068 192.168.0.0/16 Private-Use Networks RFC 1918 198.18.0.0/15 Network Interconnect Device Benchmark Testing RFC 2544 198.51.100.0/24 TEST-NET-2 RFC 5737 203.0.113.0/24 TEST-NET-3 RFC 5737 224.0.0.0/4 Multicast RFC 3171 240.0.0.0/4 Reserved for Future Use RFC 1112, Section 4 255.255.255.255/32 Limited Broadcast RFC 919, Section 7 RFC 922, Section 7 ------------- BUT your page says: " $cmd 00307 deny all from 204.152.64.0/23 to any in via $pif #Sun cluster interconnect $cmd 00308 deny all from 224.0.0.0/3 to any in via $pif #Class D & E multicast " but i see there's no 204.152.64.0 in RFC and there's block /4 not /3 please tell me what i don't understand? -----Reply ----------------------------------------------------------------- >> please tell me what i don't understand? CIDR addressing. 224.0.0.0/4 ==> 4 bits of network (1110) with 28 bits of mask 240.0.0.0/4 ==> 4 bits of network (1111) with 28 bits of mask These two adjacent netblocks can be represented by a single netblock for simplicity. 224.0.0.0/3 ==> 3 bits of network (111) with 29 bits of mask Matt _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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