Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 sb1000 is a module network device driver for the General Instrument (also known 2 as NextLevel) SURFboard1000 internal cable modem board. This is an ISA card 3 which is used by a number of cable TV companies to provide cable modem access. 4 It's a one-way downstream-only cable modem, meaning that your upstream net link 5 is provided by your regular phone modem. 6 7 This driver was written by Franco Venturi <fventuri@mediaone.net>. He deserves 8 a great deal of thanks for this wonderful piece of code! 9 10 ----------------------------------------------------------------------------- 11 12 Support for this device is now a part of the standard Linux kernel. The 13 driver source code file is drivers/net/sb1000.c. In addition to this 14 you will need: 15 16 1.) The "cmconfig" program. This is a utility which supplements "ifconfig" 17 to configure the cable modem and network interface (usually called "cm0"); 18 and 19 20 2.) Several PPP scripts which live in /etc/ppp to make connecting via your 21 cable modem easy. 22 23 These utilities can be obtained from: 24 25 http://www.jacksonville.net/~fventuri/ 26 27 in Franco's original source code distribution .tar.gz file. Support for 28 the sb1000 driver can be found at: 29 30 http://web.archive.org/web/*/http://home.adelphia.net/~siglercm/sb1000.html 31 http://web.archive.org/web/*/http://linuxpower.cx/~cable/ 32 33 along with these utilities. 34 35 3.) The standard isapnp tools. These are necessary to configure your SB1000 36 card at boot time (or afterwards by hand) since it's a PnP card. 37 38 If you don't have these installed as a standard part of your Linux 39 distribution, you can find them at: 40 41 http://www.roestock.demon.co.uk/isapnptools/ 42 43 or check your Linux distribution binary CD or their web site. For help with 44 isapnp, pnpdump, or /etc/isapnp.conf, go to: 45 46 http://www.roestock.demon.co.uk/isapnptools/isapnpfaq.html 47 48 ----------------------------------------------------------------------------- 49 50 To make the SB1000 card work, follow these steps: 51 52 1.) Run `make config', or `make menuconfig', or `make xconfig', whichever 53 you prefer, in the top kernel tree directory to set up your kernel 54 configuration. Make sure to say "Y" to "Prompt for development drivers" 55 and to say "M" to the sb1000 driver. Also say "Y" or "M" to all the standard 56 networking questions to get TCP/IP and PPP networking support. 57 58 2.) *BEFORE* you build the kernel, edit drivers/net/sb1000.c. Make sure 59 to redefine the value of READ_DATA_PORT to match the I/O address used 60 by isapnp to access your PnP cards. This is the value of READPORT in 61 /etc/isapnp.conf or given by the output of pnpdump. 62 63 3.) Build and install the kernel and modules as usual. 64 65 4.) Boot your new kernel following the usual procedures. 66 67 5.) Set up to configure the new SB1000 PnP card by capturing the output 68 of "pnpdump" to a file and editing this file to set the correct I/O ports, 69 IRQ, and DMA settings for all your PnP cards. Make sure none of the settings 70 conflict with one another. Then test this configuration by running the 71 "isapnp" command with your new config file as the input. Check for 72 errors and fix as necessary. (As an aside, I use I/O ports 0x110 and 73 0x310 and IRQ 11 for my SB1000 card and these work well for me. YMMV.) 74 Then save the finished config file as /etc/isapnp.conf for proper configuration 75 on subsequent reboots. 76 77 6.) Download the original file sb1000-1.1.2.tar.gz from Franco's site or one of 78 the others referenced above. As root, unpack it into a temporary directory and 79 do a `make cmconfig' and then `install -c cmconfig /usr/local/sbin'. Don't do 80 `make install' because it expects to find all the utilities built and ready for 81 installation, not just cmconfig. 82 83 7.) As root, copy all the files under the ppp/ subdirectory in Franco's 84 tar file into /etc/ppp, being careful not to overwrite any files that are 85 already in there. Then modify ppp@gi-on to set the correct login name, 86 phone number, and frequency for the cable modem. Also edit pap-secrets 87 to specify your login name and password and any site-specific information 88 you need. 89 90 8.) Be sure to modify /etc/ppp/firewall to use ipchains instead of 91 the older ipfwadm commands from the 2.0.x kernels. There's a neat utility to 92 convert ipfwadm commands to ipchains commands: 93 94 http://users.dhp.com/~whisper/ipfwadm2ipchains/ 95 96 You may also wish to modify the firewall script to implement a different 97 firewalling scheme. 98 99 9.) Start the PPP connection via the script /etc/ppp/ppp@gi-on. You must be 100 root to do this. It's better to use a utility like sudo to execute 101 frequently used commands like this with root permissions if possible. If you 102 connect successfully the cable modem interface will come up and you'll see a 103 driver message like this at the console: 104 105 cm0: sb1000 at (0x110,0x310), csn 1, S/N 0x2a0d16d8, IRQ 11. 106 sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net) 107 108 The "ifconfig" command should show two new interfaces, ppp0 and cm0. 109 The command "cmconfig cm0" will give you information about the cable modem 110 interface. 111 112 10.) Try pinging a site via `ping -c 5 www.yahoo.com', for example. You should 113 see packets received. 114 115 11.) If you can't get site names (like www.yahoo.com) to resolve into 116 IP addresses (like 204.71.200.67), be sure your /etc/resolv.conf file 117 has no syntax errors and has the right nameserver IP addresses in it. 118 If this doesn't help, try something like `ping -c 5 204.71.200.67' to 119 see if the networking is running but the DNS resolution is where the 120 problem lies. 121 122 12.) If you still have problems, go to the support web sites mentioned above 123 and read the information and documentation there. 124 125 ----------------------------------------------------------------------------- 126 127 Common problems: 128 129 1.) Packets go out on the ppp0 interface but don't come back on the cm0 130 interface. It looks like I'm connected but I can't even ping any 131 numerical IP addresses. (This happens predominantly on Debian systems due 132 to a default boot-time configuration script.) 133 134 Solution -- As root `echo 0 > /proc/sys/net/ipv4/conf/cm0/rp_filter' so it 135 can share the same IP address as the ppp0 interface. Note that this 136 command should probably be added to the /etc/ppp/cablemodem script 137 *right*between* the "/sbin/ifconfig" and "/sbin/cmconfig" commands. 138 You may need to do this to /proc/sys/net/ipv4/conf/ppp0/rp_filter as well. 139 If you do this to /proc/sys/net/ipv4/conf/default/rp_filter on each reboot 140 (in rc.local or some such) then any interfaces can share the same IP 141 addresses. 142 143 2.) I get "unresolved symbol" error messages on executing `insmod sb1000.o'. 144 145 Solution -- You probably have a non-matching kernel source tree and 146 /usr/include/linux and /usr/include/asm header files. Make sure you 147 install the correct versions of the header files in these two directories. 148 Then rebuild and reinstall the kernel. 149 150 3.) When isapnp runs it reports an error, and my SB1000 card isn't working. 151 152 Solution -- There's a problem with later versions of isapnp using the "(CHECK)" 153 option in the lines that allocate the two I/O addresses for the SB1000 card. 154 This first popped up on RH 6.0. Delete "(CHECK)" for the SB1000 I/O addresses. 155 Make sure they don't conflict with any other pieces of hardware first! Then 156 rerun isapnp and go from there. 157 158 4.) I can't execute the /etc/ppp/ppp@gi-on file. 159 160 Solution -- As root do `chmod ug+x /etc/ppp/ppp@gi-on'. 161 162 5.) The firewall script isn't working (with 2.2.x and higher kernels). 163 164 Solution -- Use the ipfwadm2ipchains script referenced above to convert the 165 /etc/ppp/firewall script from the deprecated ipfwadm commands to ipchains. 166 167 6.) I'm getting *tons* of firewall deny messages in the /var/kern.log, 168 /var/messages, and/or /var/syslog files, and they're filling up my /var 169 partition!!! 170 171 Solution -- First, tell your ISP that you're receiving DoS (Denial of Service) 172 and/or portscanning (UDP connection attempts) attacks! Look over the deny 173 messages to figure out what the attack is and where it's coming from. Next, 174 edit /etc/ppp/cablemodem and make sure the ",nobroadcast" option is turned on 175 to the "cmconfig" command (uncomment that line). If you're not receiving these 176 denied packets on your broadcast interface (IP address xxx.yyy.zzz.255 177 typically), then someone is attacking your machine in particular. Be careful 178 out there.... 179 180 7.) Everything seems to work fine but my computer locks up after a while 181 (and typically during a lengthy download through the cable modem)! 182 183 Solution -- You may need to add a short delay in the driver to 'slow down' the 184 SURFboard because your PC might not be able to keep up with the transfer rate 185 of the SB1000. To do this, it's probably best to download Franco's 186 sb1000-1.1.2.tar.gz archive and build and install sb1000.o manually. You'll 187 want to edit the 'Makefile' and look for the 'SB1000_DELAY' 188 define. Uncomment those 'CFLAGS' lines (and comment out the default ones) 189 and try setting the delay to something like 60 microseconds with: 190 '-DSB1000_DELAY=60'. Then do `make' and as root `make install' and try 191 it out. If it still doesn't work or you like playing with the driver, you may 192 try other numbers. Remember though that the higher the delay, the slower the 193 driver (which slows down the rest of the PC too when it is actively 194 used). Thanks to Ed Daiga for this tip! 195 196 ----------------------------------------------------------------------------- 197 198 Credits: This README came from Franco Venturi's original README file which is 199 still supplied with his driver .tar.gz archive. I and all other sb1000 users 200 owe Franco a tremendous "Thank you!" Additional thanks goes to Carl Patten 201 and Ralph Bonnell who are now managing the Linux SB1000 web site, and to 202 the SB1000 users who reported and helped debug the common problems listed 203 above. 204 205 206 Clemmitt Sigler 207 csigler@vt.edu