Last week, I subscribed to a new ISP (Free), to benefit from discounts as well as better hardware, gateway and set-top-box.
My new ISP and the incumbent operator were fast enough to take over my DSL line not even 2 days after my subscription. Though, Free did not bother sending the new equipment yet, I was left with the gateway from my previous ISP which was not connecting anymore.
To get back online, I had to pull out a few tricks I used to do a while back when I was at Mandriva with the only legacy modem I got: a green Speedtouch USB (nicknamed the "manta ray").
Unfortunately, the DrakX network tools that I used to maintain do not seem to work anymore with this modem and the quite unusual DSL connection using IP over ATM.
I had to install the
speedtouch-firmware package, needed by the
spedtch module, as well as
linux-atm, providing the
The modem was synchronizig fine, though about twice as slow as usual
(this is an ADSL1 modem), according to the
[14264369.849647] ATM dev 0: ADSL line is synchronising [14264413.298572] ATM dev 0: DSL line goes up [14264413.307430] ATM dev 0: ADSL line is up (7200 kb/s down | 896 kb/s up)
There are a few
atmarp commands to run to configure IP over ATM:
# atmarpd -b -l syslog # atmarp -c atm0 # ifconfig atm0 22.214.171.124 netmask 255.255.255.0 mtu 1500 up # ip link set dev atm0 down # ip link set dev atm0 up # atmarp -s 126.96.36.199 8.36 null
# ping 188.8.131.52 PING 184.108.40.206 (220.127.116.11) 56(84) bytes of data. 64 bytes from 18.104.22.168: icmp_seq=1 ttl=64 time=37.9 ms # route add default gw 22.214.171.124
To avoid ATM fragmentation, we can configure the MTU to match a whole number of ATM cells (thanks Loïc!):
ifconfig atm0 mtu 1480
Finally, to use my PC as a gateway on my local network:
iptables -t nat -F POSTROUTING iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -j MASQUERADE
That's pretty old school, but I am back on the Internet! :-)