Another place where packets with an unspecified source address are
legitimately used is with MLD, when you are sending a Report before your
unicast addresses have finished DAD.
I think routers should check for the unspecified source address and not
forward such packets.
The other cases that you outline, I think can probably be left undefined.
Rich
> -----Original Message-----
> From: Jun-ichiro itojun Hagino [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, July 26, 2000 7:45 PM
> To: [EMAIL PROTECTED]
> Subject: IPv6 packets with unspecified source address
>
>
> This is kind of "host/router requirement" question...
>
> IPv6 base specification allows (does not prohibit) use
> of unspecified
> IPv6 address in source address. The question we have is, how
> legitimate it is to use unspecified IPv6 address in
> source address.
>
> The only use we have in our document is:
> - neighbor solicitation with unspecified IPv6 source, for DAD
>
> Please consider the following examples. Are these
> examples legal?
> - IPv6 ICMPv6 packet with unspecified source address,
> which is DAD.
> (this one should be legal, since it is documented in RFC2462)
>
> - IPv6 ICMPv6 packet with unspecified source address,
> which is NOT DAD.
>
> - IPv6 TCP packet with unspecified source address.
> this form of packet can be used to make a DoS attack.
> careless
> implementation may create TCP control block with local
> address = mine, and foreign address = unspecified, in
> state SYN_RCVD.
> this may disable wildcard listening TCP socket from
> being contacted
>
> - IPv6 UDP packet with unspecified source address.
>
> - other upper layer protocol with unspecified source address.
>
> - mobile-ip6 home address option with unspecified address.
>
> - a router which forwards packets with unspecified
> source address.
> if we consider that DAD is the only legal use, we
> should not forward.
>
> itojun
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