> -----Original Message----- > From: Michael Richardson <mcr+i...@sandelman.ca> > > In the ADD WG, Barbara STARK, BARBARA H <bs7...@att.com> wrote: > > [BHS] While my ISP requires me to use the CE router they supply, I’ve > > never had an issue connecting that to my own router and then running > my > > home network from my router. The CE router from my particular ISP > > (YMMV) even automatically passes on the public IPv4 address it acquires > > and a /64 IPv6 prefix to my router (so IPv4 just has the single NAT and > > IPv6 works great). I have total ability to choose any router I want and > > configure that router as much as that router vendor’s GUI allows (e.g., > > 1) Does your ISP provides router auto-detect that there is another router > behind > it, and turn itself into a modem only? or did you have configure that?
The ISP router auto-detects the presence of a router on its LAN and uses a capture screen to ask the user if they want the ISP router to go into "IPv4 passthrough" mode. The ISP router does not become a modem-only. It is still a router. It still sets up the WAN connection and does all DHCP to the WAN and gets IP address and prefix delegations from the WAN. For IPv4 passthrough, it keeps a couple of ports of the public IPv4 address for its own management purposes, and delegates (DHCPv4) that public IPv4 address to the internal "passed through to" router (and forwards all inbound traffic to all other ports to the internal router). It has its own IPv6 /64 prefix, and requests a 2nd /64 prefix it then delegates to the internal router. If any other DHCPv6 IA_PD requests come from the LAN, it will request additional /64 prefixes for those -- so this function is independent of passthrough mode which is an IPv4-only function. > 2) I can imagine how a cable modem/router could become a bridge, and all > would be well. > But, I think that AT&T is more in the DSL space with PPPoE. > Does this work for PPPoE, and if so, do you have to put the PPPoE > password, into your "own" router? > The ppp password is among those things that ISPs like to provision > automatically. PPPoE is only legacy (old ADSL). The IPv4 passthrough does work there (because the ISP router is still a router, as described above). IPv6 on legacy is 6rd with a /60 -- so the IPv6 stuff is different. Fiber, VDSL, and Gfast (and some newer ADSL) are IPoE (PTM), and not IP o PPPoE o ATM. Here is some info (includes instructions to directly configuring IP passthrough): https://www.att.com/Common/storefront/resources/pdf/att_bridged_mode_vs_ip_passthrough_nov2012_v3.pdf > I'm really hoping that there is some technology out there that I'm ignorant > of. > (but, I'm cynically thinking that the technology involves sending Barbara out > in a GPS equipped truck) Hah! No. We've been doing IPv4 passthrough for 15+ years. Barbara _______________________________________________ homenet mailing list homenet@ietf.org https://www.ietf.org/mailman/listinfo/homenet
