Development issues regarding the cerowrt test router project
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From: Steven Barth <cyrus@openwrt.org>
To: "Ole Trøan" <otroan@employees.org>
Cc: cerowrt-devel@lists.bufferbloat.net
Subject: Re: [Cerowrt-devel] Current state of ipv6 in openwrt barrier breaker
Date: Tue, 11 Dec 2012 21:46:59 +0100	[thread overview]
Message-ID: <b2e6e3482f87119a1847afabee5802cb@midlink.org> (raw)
In-Reply-To: <8F973FF7-B39D-4E21-B889-14F6105A29F4@employees.org>

Hi Ole,

your feedback is appreciated, thanks.
Just to clarify a few things here because I think there might be
misunderstandings.


> or create state...
> NPT should not be on by default though
I agree and it won't be a default in plain OpenWrt.


> I think the the ULA prefix should be created as specified in RFC4193.
> otherwise you'll get into trouble merging networks, or building a
> mesh with your neighbour.
> (overlapping ULA space).
In the current implementation /dev/urandom is used to generate the /48
on the first boot of the device. fd00:: was just an example here.
I don't see any particular advantage in using the sha / ntp etc. thing
especially since there might not be a working RTC.


> shouldn't all interface have a /64?
I won't restrict users doing anything else but /64 is the default, yes.


> actually it should not be expected to have global reachability.
> doing ULA to global translation by default would break one of the
> ideas we have in the homenet WG,
> about allowing devices on the network not being prepared to be on the
> global Internet use ULAs. that way
> we can avoid firewalls on the network borders, and still protect the
> unprepared... ;-)
Yes the problem is that source address selection seems to be a trouble
on clients. I just had users / tester complain yesterday about devices
using ULA instead of the 200X: source addresses breaking connectivity
when both are announced so now I had to implement a hack that sets
the preferred time of the ULA to 0 when there are prefixes with global
reachability.


Similarly I see NPT only as a way to work around client issues
- especially when having multi-homing / redundant uplinks -
and not as a default way of doing things.


Cheers,

Steven

  parent reply	other threads:[~2012-12-11 20:46 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-11 19:56 Ole Trøan
2012-12-11 20:25 ` Dave Taht
2012-12-11 21:31   ` Ole Trøan
2012-12-12  8:19     ` Dave Taht
2012-12-12  9:08       ` Ole Trøan
2012-12-12  9:19         ` Steven Barth
2012-12-12  9:28           ` Ole Trøan
2012-12-12  9:47             ` Steven Barth
2012-12-12 10:11               ` Dave Taht
2012-12-12 18:56       ` Michael Richardson
2012-12-12  9:05     ` Török Edwin
2012-12-11 20:46 ` Steven Barth [this message]
2012-12-11 21:02   ` Ole Trøan
2012-12-12  8:23     ` Steven Barth
2012-12-12  8:43       ` Ole Trøan
  -- strict thread matches above, loose matches on Subject: below --
2012-12-10  8:41 Dave Taht
2012-12-10  9:15 ` Dave Taht
2012-12-10 11:27   ` Steven Barth
2012-12-10 11:40     ` Dave Taht
2012-12-10 11:53       ` Steven Barth

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