http://Traverse.kd85.com/

Click here for full dmesg of the Viking PCI ADSL2+ modem in a Soekris 5501-70 running OpenBSD 4.5.

The important bit:

re0 at pci0 dev 14 function 0 "Realtek 8139" rev 0x20: RTL8139C+ (0x7480), irq 10, address 00:0a:fa:20:03:62
rlphy0 at re0 phy 0: RTL internal PHY

Configuring the setup:

assign 192.168.1.2 to the re0 device with ifconfig

# telnet 192.168.1.1 (this is the modem device, hidden behind the re0)
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.

                ,vvvdP9P???^   ,,,
              vvd###P^`^         vvvvv v
         vv#####?^                  ????####vv,
      vv####??     ,vvvdP???^  ,,,        ??##^
     v#####?    ,vvd##P?^        #?#v#vvv
   v#####?    v###P^    ,vvv,        '?#?,
  ######?   ####?^ ,vd#P?^     `???##
  #####?   v####  ,d##P^           ''
 ######   v####  ]###L                   _   _          _                  ___
 #####?   v####  ]##L                   /   / \  |\ |  |_  \/   /\   |\ |   |
 ######    ####  ]###L                  \_  \_/  | \|  |_  /\  /--\  | \|   |
 ?#####v   ####v  ]##h,            ,,
  ?#####    ?###h,  `9#hv,     ,vv###
    ######    #####L    ]###L        ,v#v'
    ?#####vv    ?9##hv,        ,,vvvv###'
       ?#####vv     `??9P\vv,   ^         vv##,
          ######                       #######L
            ??###hvv,          ,vvv#?##?????
                `????9hdhvv,

Login: admin
Password: *****   (passwd is admin)

Login successful

--> ?
agent            Get a file from a remote host
ald              Configuration commands for ald
bridge           Configure layer 2 bridge
classifier       Packet classifier configuration commands
console          Console access
dhcpclient       DHCP client configuration commands
dhcpserver       DHCP server configuration commands
dnsclient        DNS client configuration commands
dnsrelay         DNS relay configuration
dslhome          CWMP configuration commands
ethernet         Commands to configure ethernet transports
firewall         Firewall configuration commands
help             Top level CLI help
igmp             igmp configuration commands
imdebug          Directly access the information model
ip               Configure IP router
meter            Packet metering configuration command
nat              NAT configuration commands
port             Physical port configuration commands
pppoa            PPP over ATM configuration
pppoe            PPP over Ethernet Configuration
resetButton      
rfc1483          Commands to configure RFC1483 transports
scanpvc          Scanpvc Commands - AutoConfiguring PVCs on the system
scheduler        Configuration commands for scheduler 
security         Security configuration commands not specific to NAT or firewall
snmp             
sntpclient       Simple Network Time Protocol Client commands
source           Read a file of commands
stop             
system           System administration commands
transports       Transport configuration commands
upnp             UPnP configuration commands
user             User commands
webserver        Webserver configuration commands
--> ip delete interface ipwan

--> bridge add interface br0

--> bridge attach br0 ethernet

--> rfc1483 add transport tr1 a1 8 35 llc bridged

--> bridge add interface br1

--> bridge attach br1 tr1

--> system config save
Saving Configuration...

--> system ?
add              Add a user to the system
auto-update      Update device firmware automatically from a remote server
config           Configuration file maintenance
cpuload          Show current CPU loading
delete           Remove system users
info             Display hardware/software information
legal            
list             List system information
log              Set logging options
restart          Restart system (same as pressing reset)
set              Set user privileges
--> system restart
Connection closed by foreign host.
# ifconfig pppoe0
pppoe0: flags=8810 mtu 1484
        priority: 0
        dev: re0 state: PADI sent
        sid: 0x0 PADI retries: 7 PADR retries: 0
        groups: pppoe egress
        inet6 fe80::200:24ff:fecb:9fb4%pppoe0 ->  prefixlen 64 scopeid 0x8
        inet 0.0.0.0 --> 0.0.0.1 netmask 0xffffffff
# ifconfig pppoe0 down
# ifconfig pppoe0 up
# ifconfig pppoe0
pppoe0: flags=8851 mtu 1484
        priority: 0
        dev: re0 state: session
        sid: 0x3a7f PADI retries: 0 PADR retries: 0 time: 00:00:02
        sppp: phase network authproto pap authname "dsl48888@schedom" 
        groups: pppoe egress
        inet6 fe80::200:24ff:fecb:9fb4%pppoe0 ->  prefixlen 64 scopeid 0x8
        inet 83.101.24.229 --> 83.101.24.193 netmask 0xffffffff

Config files:

hostname.re0

inet 192.168.1.2 255.255.255.0 NONE
mtu 1492
up

hostname.pppoe0

inet 0.0.0.0 255.255.255.255 0.0.0.1 pppoedev re0 authproto pap authname dsl48888@schedom authkey WWWWWVVV up
!/sbin/route add default 0.0.0.1

For getting M0n0wall to recognise this card, check this article