The "default" mtu of 576 is because, well, 2400 baud signaling is pretty 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 echo times in the order of seconds per character.
I believe LCP uses a signed two-octet integer for frame size negotiation, so you can negotiate quite large frames if you so desire and so configure your endpoints. --- () ascii ribbon campaign against html e-mail /\ www.asciiribbon.org > > > -----Original Message----- > > From: Frank Bulk (iname.com) [mailto:frnk...@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 work > > over > > a dial-up connection. > > > > Please correct me if someone has this working out of the box. > > > > Frank > > > > -----Original Message----- > > From: Mark Jeremy [mailto:mej...@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 think 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 IPv6 > > operate on the layer 3 of the OSI model which is taken care of by the > RAS. > > So basically any dial-up modem support IPv6. > > > > -MJ > > > > -----Original Message----- > > From: Justin Wilson [mailto:li...@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 > > that¹s cool. But my question is what dial-up hardware supports v6? I am > > *assuming* Cisco does. > > > > > > Justin > > > > -- > > Justin Wilson <j...@mtin.net> > > Aol & Yahoo IM: j2sw > > http://www.mtin.net/blog xISP News > > http://www.zigwireless.com High Speed Internet Options > > http://www.thebrotherswisp.com The Brothers Wisp > > > > > > > > -----Original Message----- > > From: Joe <sj_h...@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 in > > >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 ) Should > > >each customer be assigned to ipv6 subnet prefix like /64 unique > > >universily? I've read a rfc which stated point-to-point like should > 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 avoided > > >when BAS is assigned a /64 or longer prefix. > > >3. we are testing some BAS with IPv6 accessing, in radius accouting > > >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 in > 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 > > > > > > > > > > >
