[161801] in North American Network Operators' Group
RE: Question on Ipv6 address
daemon@ATHENA.MIT.EDU (Keith Medcalf)
Wed Mar 27 01:41:02 2013
Date: Tue, 26 Mar 2013 23:40:42 -0600
In-Reply-To: <ceadf59490171c458d4c8cbb23decdb9@mail.dessus.com>
From: "Keith Medcalf" <kmedcalf@dessus.com>
To: "'North American Network Operators' Group'" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
The "default" mtu of 576 is because, well, 2400 baud signaling is pret=
ty
darn slow and interactive performance (or any kind of multileaving of =
more
than a single connection packet stream) is, what do we call it, laggy.
Sort of like trying to telnet while doing a bulk transfer if you have
bloated buffers, and do not use a decent QoS scheduler -- only with ec=
ho
times in the order of seconds per character.
I believe LCP uses a signed two-octet integer for frame size negotiati=
on,
so you can negotiate quite large frames if you so desire and so config=
ure
your endpoints.
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>
> > -----Original Message-----
> > From: Frank Bulk (iname.com) [mailto:frnkblk@iname.com]
> > Sent: Tuesday, 26 March, 2013 22:46
> > To: 'Mark Jeremy'; Justin Wilson
> > Cc: nanog@nanog.org
> > Subject: RE: Question on Ipv6 address
> >
> > My understanding is that because IPv6 has a minimum MTU of 1280 and
> dial-
> > up
> > maxes out at 576, that special measures must be taken for IPv6 to w=
ork
> > over
> > a dial-up connection.
> >
> > Please correct me if someone has this working out of the box.
> >
> > Frank
> >
> > -----Original Message-----
> > From: Mark Jeremy [mailto:mejndp@rit.edu]
> > Sent: Tuesday, March 26, 2013 2:10 PM
> > To: Justin Wilson
> > Cc: nanog@nanog.org
> > Subject: RE: Question on Ipv6 address
> >
> > Justin,
> >
> > Dial-up modem is just a layer 2 device with no IP address. Just thi=
nk of
> > it
> > as a converter, its sole function is to convert the telephone line =
to
> > something your PC can use, in this case, Ethernet. Both IPv4 and IP=
v6
> > operate on the layer 3 of the OSI model which is taken care of by t=
he
> RAS.
> > So basically any dial-up modem support IPv6.
> >
> > -MJ
> >
> > -----Original Message-----
> > From: Justin Wilson [mailto:lists@mtin.net]
> > Sent: Tuesday, March 26, 2013 12:06 PM
> > To: NANOG
> > Subject: Re: Question on Ipv6 address
> >
> > I don't mean to hijack the thread so if someone wants to open a new=
one
> > that=B9s cool. But my question is what dial-up hardware supports v=
6? I am
> > *assuming* Cisco does.
> >
> >
> > Justin
> >
> > --
> > Justin Wilson <j2sw@mtin.net>
> > Aol & Yahoo IM: j2sw
> > http://www.mtin.net/blog =AD xISP News
> > http://www.zigwireless.com =AD High Speed Internet Options
> > http://www.thebrotherswisp.com =AD The Brothers Wisp
> >
> >
> >
> > -----Original Message-----
> > From: Joe <sj_hznm@hotmail.com>
> > Date: Tuesday, March 26, 2013 11:39 AM
> > To: NANOG <nanog@nanog.org>
> > Subject: Question on Ipv6 address
> >
> > >I'm new to Ipv6 and trying to understanding something about IPv6 i=
n
> > >service provider network.
> > >I've got the following questions , could anybody do some helps?
> > >1. In a dial-up network (Q-in-Q for each customer who dials in ) S=
hould
> > >each customer be assigned to ipv6 subnet prefix like /64 unique
> > >universily? I've read a rfc which stated point-to-point like sh=
ould
> be
> > >assigned /64. But to my understanding, in dial-up network , each=
user
> > >should only needed to be assigned a single ipv4 address, with wich
> > >customer could used in his PC or his home router.
> > >2. In dial-up network, could each vlan's ipv6 link-id be planned=
with
> > >its vlan number? if so, IP v6 address confliction could be av=
oided
> > >when BAS is assigned a /64 or longer prefix.
> > >3. we are testing some BAS with IPv6 accessing, in radius accoutin=
g
> > >packets, there is IP-v6-prefix, Ip-v6-link-id,
> > >Ip-v6-delegated-prefix. how could dial-up PC's IPv6 address=
be
> > >calculated with above information?
> > >4. should it be necessary to plan different
> > >IP-v6-prefix(IP-v6-delegated-prefix) for each dial-up customers i=
n
> BAS?
> > >5. How could delegated IPv6 prefix be used in service provider's
> network?
> > >is this useful in dial-up access network?
> > >
> > >each word will be highly appreciated.
> > >Joe
> > >
> >
> >
> >
> >
