Hi, stupid me: I simply cannot connect to a PPPoA provider because the TP-Link TD-8616 does not support PPPoA (actually PPPoE to PPPoA conversion)
i.e. see this forum thread: http://forum.tp-link.com/showthread.php?1638-TD-8616-and-PPPoA (To be sure I have send a question to TP-Link technical support, and to my surprise the answer is: no support for PPPoA.) * Maciej Żenczykowski [2015-03-19 20:51:20 -0700]: > There are modems out there that can convert PPPoA from telephone wire > into PPPoE on ethernet cable. OK now I'm starting to understand how it works (or doesn't work for me): I cannot connect to a PPPoA provider via an **external modem** unless the modem is capable of "PPPoE to PPPoA" protocol conversion: https://en.wikipedia.org/wiki/Point-to-point_protocol_over_Ethernet#PPPoE_to_PPPoA in other words - if I get it - OpenWRT can connect over PPPoA only if the router is equipped with and ADSL+ port (I never tested one) > See (for example) http://www.draytek.co.uk/products/business/vigor-120 I'm not able to find another modem out there capable of "PPPoE to PPPoA" protocol conversion: https://en.wikipedia.org/wiki/Point-to-point_protocol_over_Ethernet#Quirks (last sentence) [...] > Word of warning though (since I have the modem, although not > [currently] using it in that mode): > > The networking stack on it is pretty terrible and it doesn't obey > stuff like responding correctly with MTU exceeded errors or forwarding > them correctly or something. this is exactly what I'm trying to avoid I'm victim of a black hole connection when scp(ing) to one of my hosts (hosted by one of my providers) and I'm almost sure it depends on some poorly configured firewall blocking ICMP messages needed for PMTUD: https://en.wikipedia.org/wiki/Path_MTU_Discovery#Problems_with_PMTUD connecting *directly* with OWRT router (not natted trough external router connected via PPPoA) I'm hoping OWRT to better control MSS clamping in order to avoid that black hole > Don't recall specifics. Not sure if > this applies to when you are running it in this special PPPoA-PPPoE > bridge mode, since I've not yet tried that. I think that the problem you are describing will "magically" disappear since the linux networking stack *should* manage MTU discovery problems pretty well **please** test PPPoE to PPPoA conversion and let us know how it is working :-) > I'm still searching for a decent ADSL modem for my parents' place > (terrible wiring, I like to say internet is down 5 minutes every > hour)... I still haven't found what I'm looking for * Weedy [2015-03-19 23:58:18 -0400]: > On Mar 19, 2015 11:51 PM, "Maciej Żenczykowski" <[email protected]> > wrote: > > I'm still searching for a decent ADSL modem for my parents' place > > (terrible wiring, I like to say internet is down 5 minutes every > > hour)... > > Speedstream 4200 http://www.speedguide.net/routers/siemens-speedstream-4200-adsl122-router-319 it's a router (also discontinuad) > Speedtouch 516 v6 http://www.speedguide.net/routers/technicolor-thomson-speedtouch-516-multi-user-adsl-32 it's a router (also discontinued) > SmartRG <like, all of them> http://smartrg.com/adsl2/ are all *routers* (e.g. The SR10 combines a full-rate ADSL2+ modem as well as a router, firewall, and TR-069 management. ) I would like to avoid dual natting my internet connections and only use the OWRT network stack for my internet connections best regards Giovanni -- Giovanni Biscuolo Xelera - IT infrastructures http://xelera.eu/contact-us/
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