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+sb1000 is a module network device driver for the General Instrument (also known
+as NextLevel) SURFboard1000 internal cable modem board. This is an ISA card
+which is used by a number of cable TV companies to provide cable modem access.
+It's a one-way downstream-only cable modem, meaning that your upstream net link
+is provided by your regular phone modem.
+This driver was written by Franco Venturi <email@example.com>. He deserves
+a great deal of thanks for this wonderful piece of code!
+Support for this device is now a part of the standard Linux kernel. The
+driver source code file is drivers/net/sb1000.c. In addition to this
+you will need:
+1.) The "cmconfig" program. This is a utility which supplements "ifconfig"
+to configure the cable modem and network interface (usually called "cm0");
+2.) Several PPP scripts which live in /etc/ppp to make connecting via your
+cable modem easy.
+ These utilities can be obtained from:
+ in Franco's original source code distribution .tar.gz file. Support for
+ the sb1000 driver can be found at:
+ along with these utilities.
+3.) The standard isapnp tools. These are necessary to configure your SB1000
+card at boot time (or afterwards by hand) since it's a PnP card.
+ If you don't have these installed as a standard part of your Linux
+ distribution, you can find them at:
+ or check your Linux distribution binary CD or their web site. For help with
+ isapnp, pnpdump, or /etc/isapnp.conf, go to:
+To make the SB1000 card work, follow these steps:
+1.) Run `make config', or `make menuconfig', or `make xconfig', whichever
+you prefer, in the top kernel tree directory to set up your kernel
+configuration. Make sure to say "Y" to "Prompt for development drivers"
+and to say "M" to the sb1000 driver. Also say "Y" or "M" to all the standard
+networking questions to get TCP/IP and PPP networking support.
+2.) *BEFORE* you build the kernel, edit drivers/net/sb1000.c. Make sure
+to redefine the value of READ_DATA_PORT to match the I/O address used
+by isapnp to access your PnP cards. This is the value of READPORT in
+/etc/isapnp.conf or given by the output of pnpdump.
+3.) Build and install the kernel and modules as usual.
+4.) Boot your new kernel following the usual procedures.
+5.) Set up to configure the new SB1000 PnP card by capturing the output
+of "pnpdump" to a file and editing this file to set the correct I/O ports,
+IRQ, and DMA settings for all your PnP cards. Make sure none of the settings
+conflict with one another. Then test this configuration by running the
+"isapnp" command with your new config file as the input. Check for
+errors and fix as necessary. (As an aside, I use I/O ports 0x110 and
+0x310 and IRQ 11 for my SB1000 card and these work well for me. YMMV.)
+Then save the finished config file as /etc/isapnp.conf for proper configuration
+on subsequent reboots.
+6.) Download the original file sb1000-1.1.2.tar.gz from Franco's site or one of
+the others referenced above. As root, unpack it into a temporary directory and
+do a `make cmconfig' and then `install -c cmconfig /usr/local/sbin'. Don't do
+`make install' because it expects to find all the utilities built and ready for
+installation, not just cmconfig.
+7.) As root, copy all the files under the ppp/ subdirectory in Franco's
+tar file into /etc/ppp, being careful not to overwrite any files that are
+already in there. Then modify ppp@gi-on to set the correct login name,
+phone number, and frequency for the cable modem. Also edit pap-secrets
+to specify your login name and password and any site-specific information
+8.) Be sure to modify /etc/ppp/firewall to use ipchains instead of
+the older ipfwadm commands from the 2.0.x kernels. There's a neat utility to
+convert ipfwadm commands to ipchains commands:
+You may also wish to modify the firewall script to implement a different
+9.) Start the PPP connection via the script /etc/ppp/ppp@gi-on. You must be
+root to do this. It's better to use a utility like sudo to execute
+frequently used commands like this with root permissions if possible. If you
+connect successfully the cable modem interface will come up and you'll see a
+driver message like this at the console:
+ cm0: sb1000 at (0x110,0x310), csn 1, S/N 0x2a0d16d8, IRQ 11.
+ sb1000.c:v1.1.2 6/01/98 (firstname.lastname@example.org)
+The "ifconfig" command should show two new interfaces, ppp0 and cm0.
+The command "cmconfig cm0" will give you information about the cable modem
+10.) Try pinging a site via `ping -c 5 www.yahoo.com', for example. You should
+see packets received.
+11.) If you can't get site names (like www.yahoo.com) to resolve into
+IP addresses (like 184.108.40.206), be sure your /etc/resolv.conf file
+has no syntax errors and has the right nameserver IP addresses in it.
+If this doesn't help, try something like `ping -c 5 220.127.116.11' to
+see if the networking is running but the DNS resolution is where the
+12.) If you still have problems, go to the support web sites mentioned above
+and read the information and documentation there.
+1.) Packets go out on the ppp0 interface but don't come back on the cm0
+interface. It looks like I'm connected but I can't even ping any
+numerical IP addresses. (This happens predominantly on Debian systems due
+to a default boot-time configuration script.)
+Solution -- As root `echo 0 > /proc/sys/net/ipv4/conf/cm0/rp_filter' so it
+can share the same IP address as the ppp0 interface. Note that this
+command should probably be added to the /etc/ppp/cablemodem script
+*right*between* the "/sbin/ifconfig" and "/sbin/cmconfig" commands.
+You may need to do this to /proc/sys/net/ipv4/conf/ppp0/rp_filter as well.
+If you do this to /proc/sys/net/ipv4/conf/default/rp_filter on each reboot
+(in rc.local or some such) then any interfaces can share the same IP
+2.) I get "unresolved symbol" error messages on executing `insmod sb1000.o'.
+Solution -- You probably have a non-matching kernel source tree and
+/usr/include/linux and /usr/include/asm header files. Make sure you
+install the correct versions of the header files in these two directories.
+Then rebuild and reinstall the kernel.
+3.) When isapnp runs it reports an error, and my SB1000 card isn't working.
+Solution -- There's a problem with later versions of isapnp using the "(CHECK)"
+option in the lines that allocate the two I/O addresses for the SB1000 card.
+This first popped up on RH 6.0. Delete "(CHECK)" for the SB1000 I/O addresses.
+Make sure they don't conflict with any other pieces of hardware first! Then
+rerun isapnp and go from there.
+4.) I can't execute the /etc/ppp/ppp@gi-on file.
+Solution -- As root do `chmod ug+x /etc/ppp/ppp@gi-on'.
+5.) The firewall script isn't working (with 2.2.x and higher kernels).
+Solution -- Use the ipfwadm2ipchains script referenced above to convert the
+/etc/ppp/firewall script from the deprecated ipfwadm commands to ipchains.
+6.) I'm getting *tons* of firewall deny messages in the /var/kern.log,
+/var/messages, and/or /var/syslog files, and they're filling up my /var
+Solution -- First, tell your ISP that you're receiving DoS (Denial of Service)
+and/or portscanning (UDP connection attempts) attacks! Look over the deny
+messages to figure out what the attack is and where it's coming from. Next,
+edit /etc/ppp/cablemodem and make sure the ",nobroadcast" option is turned on
+to the "cmconfig" command (uncomment that line). If you're not receiving these
+denied packets on your broadcast interface (IP address xxx.yyy.zzz.255
+typically), then someone is attacking your machine in particular. Be careful
+7.) Everything seems to work fine but my computer locks up after a while
+(and typically during a lengthy download through the cable modem)!
+Solution -- You may need to add a short delay in the driver to 'slow down' the
+SURFboard because your PC might not be able to keep up with the transfer rate
+of the SB1000. To do this, it's probably best to download Franco's
+sb1000-1.1.2.tar.gz archive and build and install sb1000.o manually. You'll
+want to edit the 'Makefile' and look for the 'SB1000_DELAY'
+define. Uncomment those 'CFLAGS' lines (and comment out the default ones)
+and try setting the delay to something like 60 microseconds with:
+'-DSB1000_DELAY=60'. Then do `make' and as root `make install' and try
+it out. If it still doesn't work or you like playing with the driver, you may
+try other numbers. Remember though that the higher the delay, the slower the
+driver (which slows down the rest of the PC too when it is actively
+used). Thanks to Ed Daiga for this tip!
+Credits: This README came from Franco Venturi's original README file which is
+still supplied with his driver .tar.gz archive. I and all other sb1000 users
+owe Franco a tremendous "Thank you!" Additional thanks goes to Carl Patten
+and Ralph Bonnell who are now managing the Linux SB1000 web site, and to
+the SB1000 users who reported and helped debug the common problems listed
+ Clemmitt Sigler