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I heard that the destination address in a packet can't be 0.0.0.0.

Is there any IP address (including special ones) which can't be the source address in a packet?

Thanks.

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Multicast addresses cannot be the source address of a packet.

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Only unicast ip addresses can be the source address of a packet . In IPv4 class A B C are unicast addresses . Class D addresses are multicast and cannt use as source ip address

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    Network classes are dead (please let them rest in peace), killed in 1993 (probably before you were born) by RFCs 1517, 1518, and 1519, which defined CIDR (Classless Inter-Domain Routing). modern networking does not use network classes. – Ron Maupin Mar 28 at 22:01
  • What is the range of unicast addresses in ipv4 ?? – vanjelis.msr Mar 29 at 9:29
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Multicast Ip addresses or class d ip addresses cannot be source ip addresses. 224.0.0.0 - 239.255.255.255

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    Network classes are dead, killed in 1993 by RFCs 1517, 1518, and 1519, which defined CIDR (Classless Inter-Domain Routing). Modern networking does not use network classes. – user36472 Mar 29 at 11:45

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