[prev in list] [next in list] [prev in thread] [next in thread] 

List:       ipng
Subject:    RE: ICMPv6 question
From:       "Templin, Fred L" <Fred.L.Templin () boeing ! com>
Date:       2017-08-31 23:51:12
Message-ID: b8a0cd9adfbb4c2d8c92dddc49b41cf3 () XCH15-06-08 ! nw ! nos ! boeing ! com
[Download RAW message or body]

HI Bert,

> -----Original Message-----
> From: Manfredi, Albert E
> Sent: Thursday, August 31, 2017 4:36 PM
> To: Templin, Fred L <Fred.L.Templin@boeing.com>; 6man WG <ipv6@ietf.org>
> Subject: RE: ICMPv6 question
> 
> -----Original Message-----
> From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Templin, Fred L
> 
> > I have a question. If an IPV6 host with address 2001:db8::f00
> > assigned to an interface receives a packet with destination address
> > 2001:db8::baa over that interface, what should it do? Drop the
> > packet silently, or drop and return an ICMPv6 Destination
> > Unreachable?
> 
> You said host and not router.

Yes - host.

> Assuming that the prefix length is the same for the intended destination of the \
> packet and for the host that received the packet, so the packet is not misrouted,

Yes - assume that the prefix 2001:db8::/64 is assigned to the incoming interface.

> then this sounds like what you'd frequently expect to see in older Ethernets,
> either coax Ethernets or half duplex ones that use hubs. But why didn't the \
> Ethernet interface discard the packet? The MAC address should not have matched. Was \
> it a ND failure scenario of some kind?

I am assuming that the bogus packet uses a correct MAC destination address
but with an incorrect IPv6 destination address. So, the packet gets handed
up to the IPv6 layer.

> (In general, I don't see why a host should send host unreachable ICMP messages.)

Drop silent would make sense to me, too - but do others think an ICMP
should be generated?

Thanks - Fred

> Bert


--------------------------------------------------------------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------


[prev in list] [next in list] [prev in thread] [next in thread]