If your "external ISDN device" is really a router, things will work fine.
You don't need any Linux ISDN support for that.
However, if the device is a low end bridge, or a deliberately crippled low-end
router than can only handle a single host, you'll have trouble. In that case
you may want to set up IP masquerading, so that one box will hide all of the
others.
Also, if your ISP only gives you a single IP address you will need IP
masquerading.
> (to add more memory to UDBs)
> - How much memory needed for UDB running Linux? I have 24mb each now.
24 MB is tight on the earlier a.out distributions (e.g. Red Hat up through
release 3.0.3), and you may have lots of swapping. Elf distributions (e.g.
Red Hat 4.0) use shared libraries so the memory footprint is smaller.
Usually 24 MB on a 166 MHz UDB consists of a pair of 8 MB SIMMs and a pair
of 4 MB SIMMs. To expand the memory you will have to replace at least one
pair.
On a 233 MHz UDB, they usually used a pair of special 12 MB SIMMs, which
will only work in the UDB in the first pair of SIMM sockets. This leaves
one pair of sockets available.
Memory for the UDB *must* be true 36-bit memory. 32-bit memory won't work,
and neither will "logic parity" memory.
Cheers,
Eric
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