It is expected for the user to have a _strong_ understanding of how Linux (and UNIX) systems and networks should be configured.
The LRP image in this directory uses a higer density format than is common in the PC world. To accomidate extra software the floppy is formatted for 1722K (instead of the standard 1440K). This format will work fine with modern floppy drives. You will need to make sure you have the file /dev/fd0u1722. If not use the mknod command to create it: 'mknod /dev/fd0u1722 b 2 60'. Next use superformat (if its not on your system use the binary here or download the source and build it) to create the disk: 'superformat /dev/fd0u1722'.
Use dd to install the image on the floppy using:
dd if=wireless-X.X.img of=/dev/fd0u1722
You should also create a bootable arlan configuration disk. Make a msdos bootable floppy and copy the arlancfg.exe onto it. Boot your arlan router box with this disk and configure your io, interrupt and system ID.
Boot your system with the wireless disk. Change your network settings to reflect your configuration. In our case we made our arlan interfaces use the same address as our ethernet interfaces, set a netmask of 255.255.255.255 and used a host-route to connect to the far side of the link. Edit your /etc/hosts, /etc/hostname, /etc/resolv.conf, /etc/gated.conf, /etc/snmpd.conf and other configuration files to your suiting, then use the backup functionality in the LRP configuration program to backup 'etc'.
In the event that your network card is not supported by the out of the box configuration (this is highly likely, as only ne support was included) you will have to add the appropriate modules. Download the kernel-36pre2-1.tar.gz file. Get the appropriate modules out of this archive and put them on your router box in /lib/modules (your methods may vary). Make any appropriate changes in /etc/modues, then back up your 'modules' with the LRP backup program.
Find out your magnetic declination for your area (probably on the the topo map somewhere). Set your map on a flat surface. Lay your compas on top of the map. Align the north-south line of the compass with the vertical line on the map. Then rotate the map (and compass) the approprate number of degrees for your area (for the bay area that would be rotating it 17' west (left)). Your map is now oriented so that its direction corresponds to the real world.
Next draw a line (with pencil probably) connecting your two nodes. Lay the compass on the line, so that its parallel with the line. Your compass may look something like that below. You now know which way your antennas should point, down to a few degrees. Use these readings to align your antennas.IMPORTANT: make sure your equipment is not up and running while using your compass. The transmitters will interfere with your magnetic compass readings.
o N \ ^ \ | \| | |\ | \ o
Network Access Solutions 7172 Regional Street Dublin, CA 94568 http://www.naswireless.com/ (925) 803-2100 Price: ~800 USD Ea.
24 dBi Parabolic Grid 2.4Ghz w/ N-type female connector
Winncom Technologies 30700 Carter Street, Unit A Solon, OH 44139 http://www.winncom.com (440) 489-9500 189 USD Ea.
RP-TNC Amphenol PN: 31-5677
TTI Inc. PO Drawer 99111 Fort Worth, TX 76199-0111 (817) 740-9000 ~5.00 ea (possible minimum of a 50 dollar order)
LMR-400 Antenna cable, N-type Male and Female connectors
Ham Radio Outlet http://www.hamradio.com 1-800-854-6046
P75 w 16MB ram, no hard disk
Junk store, your attic, etc. ~200.00 ea
Multiple machines can connect via one antenna. My ham radio guy is morally opposed to using omnidirectionals, he says: "The advantage of omnidirectional antennas is that they can hear everything in all directions. The disadvantage of omnidirectional antennas is that they do hear EVERYTHING in all directions."
We've yet to try it, as an omnidirectional antenna would be a rather expensive, and probably non-refundable, experiment. Personally I'm very impressed by the noise rejection characteristics of spread spectrum radio, and would love to try it. Takers, anyone?
Using the spread beam of a directional antenna in your LOS for multiple machines is quite feasable. Just use host based, rather than net based, routing for each of your client machines.
ifconfig eth0 my_ip_address pointopoint gateway_address route add -host gateway_address dev eth1 route add -host first_client dev eth1 route add -host second_client dev eth1
and do _not_ add "
route add host -net ...."
Notes for setting up an LRP router for use in wireless wan's ###Creating the floppy disk### to create the floppy disk you need several tools.. mtools: tools to copy files onto and off of floppy disks. fdutils: includes superformat, tool for large format floppies syslinux: linux floppydisk bootloader Insert a blank floppy and use superformat to format the floppy as such: superformat /dev/fd0 sect=21 cyl=80 -V --biggest-last that will do the large format and verify it Install the bootloader with the following command line: syslinux -s /dev/fd0 edit your syslinux.cfg. it should look kinda like this: display syslinux.dpy timeout 0 default linux append=load_ramdisk=1 initrd=root.lrp initrd_archive=minix ramdisk_size=4096 root=/dev/ram0 boot=/dev/fd0u1680,msdos LRP=modules,etc,log,gated,snmp Next copy over your files using mcopy. ###Setting up the modified root### create a tgz archive called 'extras.lrp'. this should include all your modules, your tftp client and your pnp client. it should look something like.. lib/modules/smc-ultra.o lib/modules/8390.o lib/modules/arlan.o lib/modules/ne.o lib/modules/serial.o usr/bin/tftp sbin/isapnp etc/isapnp.conf etc/init.d/isapnp etc/rc2.d/S15isapnp Make sure all your modules are cross-compiled for the proper version of the kernel. add extras to LRP= under the 'append' section of syslinux.conf. ###Faking serial console### The changes made to LRP to enable serial consoles to work were the following: edit /etc/securetty to include ttyS0 edit /etc/inittab to spawn a getty (9600,8,N,1) on ttyS0 edit /etc/init.d/init.serial (or something) to 'setserial' correctly edit /lib/makedev.cfg and /lib/devinfo to link console to ttyS0 mknod /linuxrc.tty to reflect the COM1 device (copy from ttyS0) ###Configuring modules### uncomment serial, uncomment 8390. Then put 'ne io=0x260 irq=5' followed by a line with 'smc-ultra'. After this you will set up the arlan card with the proper registration mode and spreading code. Enter 'arlan registrationMode=0 spreadingCode=3 debug=0' This will have the machine come up, set up serial, then find either the ne2000 or the SMC nic card as eth0, and finnaly set up the arlan interface as eth1 (should be arlan0 at some point). ###network settings### edit the network settings (IP, fw, etc..). Configure your default GATEWAY, Set up your IF0(eth0) interface as your ethernet interface. Set up IF1(eth1) as your arlan interface. Add a value REMHOST1, with the remote address of the far-end router. Under the section 'Static Network Routes' add a line: 'route add -host $REMHOST1 gw $IPADDR1'. For some reason IPFW rules in this file prevent forwarding of packets, a strange default setting for a router. comment this line out. After editing this file I suppose you'll wanna customize the hostname too. After you've made all your edits backup 'etc'. ###More Notes### ramdisk should be increased from 4096, to perhaps 6144 or 8192. pinion is at 69% capacity, this could increase with the addition of snmp and gated. physical ram should also be increased to a minimum of 16 megs. ###Faking Large Disk### Add the nfs module to the modules that get installed at runtime. mount some remote directory and install the other packages (i.e. gated, snmp). unmount and continue as normal. Another possibility is to TFTP over the package then uncompress it. ###Online Upgrade### Here is the initial theory for upgrading a router remotely, including an increased disk size. IMPORTANT: make a backup of your existing image before attempting this upgrade! First create the disk with the upgraded software (and larger format, as required). Use a development box to properly configure this upgraded disk. The key items to get functional are the serial console ports (most anything else can be configured from here) and ethernet interface (so that any missing files can be loaded over the network). It is critical that this floppy works as expected, as failure would leave the router unbootable. * If the upgrade is a different density: Use tftp to copy a 'superformat' binary onto the router. use this superformat binary to re-format the floppy disk to the proper density: superformat /dev/fd0 sect=21 cyl=80 -V --biggest-last ==>problem: ramdisk too small? <== Next use dd to pull the disk image from your upgraded disk and copy it into your tftpboot directory... dd if=/dev/fd0 of=/tftpboot/upgrade.img Then use tftp on your router to copy this image onto your floppy.. tftp tftphost tftp> get upgrade.img /dev/fd0 This should pull the image from your tftp server and install it onto your floppy disk. once this completes, reboot your router. if all goes well it should come up properly. if not, get out a ladder climb up to your attic and put in your backup disk. start from scratch. ###Proxy Arp Configuration#### see: http://tanglefoot.lunatech.com/software/doc/HOWTO/mini/Proxy-ARP-Subnet.gz Example Network Configuration (assuming assigned block of 220.127.116.11/27) #ADSL# <-18.104.22.168/27 | -----------------------EverettsHouse 22.214.171.124/27(v28) | #WAN0# 126.96.36.199/27 (10.56.57.53/30) : #WAN1# 188.8.131.52/28 (10.56.57.54/30) | ------------------------RedwoodEstates 184.108.40.206/28 WAN0: # ethernet interface /sbin/ifconfig eth0 220.127.116.11 netmask 255.255.255.224 /sbin/route add -net 18.104.22.168 netmask 255.255.255.224 eth0 # arlan interface /sbin/ifconfig arlan0 10.56.57.53 netmask 255.255.255.252 /sbin/route add -net 10.56.57.52 netmask 255.255.255.252 arlan0 # proxy arp and routes /sbin/route add default gw 22.214.171.124 /sbin/arp -i eth0 -Ds 126.96.36.199 eth0 netmask 255.255.255.240 pub /sbin/route add -net 188.8.131.52 netmask 255.255.255.240 gw 10.56.57.54 WAN1: # ethernet interface /sbin/ifconfig eth0 184.108.40.206 netmask 255.255.255.240 /sbin/route add -net 220.127.116.11 netmask 255.255.255.240 eth0 # arlan interface /sbin/ifconfig arlan0 10.56.57.54 netmask 255.255.255.252 /sbin/route add -net 10.56.57.52 netmask 255.255.255.252 arlan0 # proxy arp and routes /sbin/route add default gw 10.56.57.53