Re: [v6ops] Routers are hosts too! (Re: I-D Action: draft-ietf-v6ops-host-addr-availability-04.txt)

[Alexandre Petrescu <[e-mail]>]

Le 07/01/2016 14:21, Gert Doering a écrit :
> Hi,
>
> On Thu, Jan 07, 2016 at 02:17:06PM +0100, Alexandre Petrescu wrote:
>> Le 07/01/2016 13:42, Gert Doering a écrit :
>>> On Thu, Jan 07, 2016 at 01:39:47PM +0100, Alexandre Petrescu
>>> wrote:
>>>> - a router does implement longest-matching algorithms, a Host
>>>> doesn't.
>>>
>>> Of course hosts do.  Why would any implementor not do that?
>>
>> Why would a Host need to look out a nexthop in routing table?  To
>> forward to whom?
>
> Well, it needs to send its own packets somewhere, no?

YEs, to its router.  There's only one - the default.  There are no 
neighbors to distinguish from.

> And guess what, this is done using the normal routing table

Yes, the 'normal' routing table because that's what we're used with 
since linux and Ethernet.

But a Host using serial to connect to a router (e.g. a UE) does not need 
a routing table.

> which (if
> you set ip.forwarding=1) magically turns into a forwarding table.
>
> Hosts can have more than one interface, like "a LAN interface and a
> VPN tunnel interface".  It really helps if they know which packet
> goes where.

YEs, but these are not pure Hosts.  They are more like desktop PCs and 
smartphones.

Alex

>
> Gert Doering -- NetMaster
>