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-
- Bridge-router documentation
-
- In the pub/pcroute/exp directory there are three files that implement
- a beta test version of a IP bridge router. These files are called
-
- bw03w03.exe A version for two WD8003E cards
- card 1: I/O address 280H
- interrupt (unused)
-
- card 2: I/O address 2A0H
- interrupt (unused)
- Note that this version is really not recommended
- for production use since the small buffer size
- of the WD8003E card will cause packets to be
- dropped under high loads and NFS traffic. Still
- it is usefull for experimentation and proof of
- concept demonstrations.
-
- bw13w13.exe A version for two WD8013EBT cards
- card 1: I/O address 280H
- interrupt (unused)
-
- card 2: I/O address 2A0H
- interrupt (unused)
-
- b3c73c7.exe a version for two 3c507 cards
- card 1: I/O address 280H
- shared memory D0000H
- shared memory size 64K
- interrupt (unused)
-
- card 2: I/O address 2A0H
- shared memory C0000H
- shared memory size 64K
- interrupt (unused)
-
- These executables look exactly like their non-bridged counterparts
- as far as setup and configuration go. Thus you should rename the
- appropriate one to PCROUTE.EXE and follow the configuration instructions
- in INSTALL.DOC file that comes with the PCroute distribution.
-
- The difference between these executables and regular PCroute is that
- in addtion to performing all the normal fucntions that PCroute does,
- it also will bridge ethernet packets between the two interfaces.
-
- Note that these bridges will NOT forward IP or ARP broadcasts because
- doing so would certainly confuse the IP network, however all other
- broadcast types are sent through.
-
- Also, non-broadcast ethernet packets are always bridged even if they
- are IP or ARP. Now normally IP hosts will only try to send packets
- to hosts/gateways on the local segment, thus these packets will be
- filtered out by the bridge, but initially, the bridge will not know
- this and some packets may get though on startup. This effect should
- be benign. If it causes problems, let me know. I can easily change the
- code so that IP and ARP packets are ALWAYS filtered even when they
- are non-broadcasts.
-
- Note that at present, only the binaries are available. This is because
- I had to make a hack because of limitations in TASM. This hack does
- not effect the code that is produced, but does complicate how it is
- compiled. Rather than try to explain this hack, I prefer simply to
- distribute the compiled form for now. Hopefully I will figure out
- a better solution to this problem soon.
-
- Vance
- morrison@accuvax.nwu.edu
-