Re: network configuration w/PPPoE on OpenBSD 2.9 current

[Mike Ayers <mike.ayers@earthling.net>]

Rick Pettit wrote:
> 
> My DSL connection with Ameritech requires PPPoE based authentictation, so
> to get up and running in a jiffy I purchased a cheapy DSL router (SMC
> Barricade), plugged it into the DSL modem, had it configured for PPPoE,
> and all was good (behind the Barricade was a NAT'd subnet with a single
> DMZ host, worked good for the time being).
> 
> Now I have a new problem.  Ameritech have me 5 static IP addresses and I
> am only making use of 1 of them (for the DSL router).  I now have a
> roomate who would like to put a webserver up on one of the free IP's, but
> I cannot let him use one without reconfiguring the network layout.
> 
> What I would like to have is this:
> 
>                         Internet
>                            |
>                            | PSTN line
>                            |
>                         DSL Modem
>                            |
>                            | Ethernet
>                            |
>                         8 port 10/100 switch
>                            |
>                            |
>                         ---------------------------------------------
>                         |      |                     |              |
>                         |      |                     |              |
>                     OpenBSD    OpenBSD     ...      OpenBSD         |
>                     Box doing  Box doing            Box doing       |
>                     PPPoE      PPPoE                PPPoE           |
>                      doing                                          |
>                      bandwidth                                  DSL Router
>                      throttling (bridge)                        + wireless
>                         |                                       AP (+NAT)
>                         |                                       |  |  |  |
>                     4 port 10/100 hub                           |  |  |  |
>                         |
>                         |                                       Misc Boxes
>                     Annoying Roomate                              below
> 
> Questions:
> 
> 1) Am I fsck'ing confused (i.e. can this work?)

	I'm pretty sure that it will, although I've never tried it myself.

> 2) does the DSL modem plug into uplink on the switch or reg. ether port?

	Mine plugs into a regular port.  Consult your owner's manual.

> 3) does the bridge (throttle box) plug into normal port or uplink on hub?

	It will plug into a regular port on the 8 port switch, and the uplink
port of the 4 port hub.

> 4) must I share my PPPoE username/passwd with every box on the "front
> lines"?

	Most likely.  If you get 5 addresses to that username, you'll need it
on each box.

> 5) does this procedure look O.K. for PPPoE on OpenBSD 2.9 current:
> 
> ppp.conf looks like:
> 
> default:
>  set log Phase Chat LCP IPCP CCP tun command
>  # set device /dev/cua01
>  # set speed 115200
>  # set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" AT OK-AT-OK
>  ATE1Q0 OK \\dATDT\\T TIMEOUT 40 CONNECT"

	That's what I've got.

> ameritech:
>   set device "!/usr/sbin/pppoe -i dc0"
>   set mtu 1492
>   set mru 1492

	I use 1488.  I believe that's what you need after overhead, but I
didn't include the ref for why I set it to that.

>   set speed sync
>   disable acfcomp protocomp
>   deny acfcomp
>   authname ********
>   authkey ********

	I also have:

        set ifaddr 0.0.0.0/0 0.0.0.0/0
        add default HISADDR
        enable loopback
        enable lqr

	The first two lines allow the IP address to be set from the far side,
the third is default but I set it anyway (just in case), and the fourth
helps detect loss of link for restart.

> 
> My procedure is to:
> 
>         1) bring up interface to do PPPoE on (ifconfig dc0 up full-duplex)

	In /etc/hostname.dc0, have one line that says "up"

>         2) # ppp pppoe

	That's "ppp ameritech" for the config you gave.

>            Working in ...
>            Using interface:  tun0
>            ppp ON somehost> dial
>            ...
> 
> By the way, I have not gotten this to work yet (haven't tried with ""'s
> around the device line in ppp.conf above).  I will try to get pppoe to
> work when I get home tonight.

	Mine works fine.  There's something else I did, but I forget what it
is.  I think I needed to add the default route, but that apparently
isn't necessary anymore.  Also, you'll need to get ipf and ipnat working
before you can route.


	HTH,

/|/|ike


P.S.  Myself, I'd plug one OpenBSD box directly into the modem and
bridge and route (and use multiple pppoe's as needed) from there, but
that's me.

> Thanks for any help.
> 
> Rick