24 Dec
2000
24 Dec
'00
12:02 p.m.
Bruce Lane wrote:
At 10:34 24-12-2000 -0500, Neil Cherry wrote:
(From a previous message:)
Let me repeat what 'You' wrote: Um,
isn't the gateway the same as the
router interface?
Not to my mind. My router, having two Ethernet ports, must have an IP
address for each of those ports. In order to be a part of the subnet on the
Cisco side, the port attached to it must have an IP address out of the
63.226 block I've been assigned. Ergo, that address is not available for a
machine.
Yes, my router does full 1:1 NAT mapping and firewalling. The Cisco is not
capable of anything near as sophisticated, so I'm simply using it for its
DSU features. The 675, based on its configuration, presents the
following subnet
on its Ethernet port.
63.226.233.136 (Reserved, Network)
63.226.233.137 (User-assignable, assigned to the Ethernet port on
'MyRouter' by yours truly).
63.226.233.138 - 141 (User-Assignable, various machines)
.142 = Default gateway address on the Cisco side (Reserved).
.143 = Broadcast (Reserved)
B
A /-----------------\
---+ +-+ +-+ +-+ +--------+
ISP|--|C|---|M|----| |---| Host 1 | <- .138
---+ |i| |y| |H| +--------+
|s| |R| |U| :
|c| |t| |B| +--------+
|o| |r| | |---| Host 5 | <- .141
+-+ +-+ +-+ +--------+
| | |
| | \-> No IP (not really needed)
| \-> .137 (2 interfaces 1 address?)
\-> .142
.136 - reserved, All zeroes broadcast or network (AKA the wire number)
.143 - reserved, All ones broadcast
OK this tells me that MyRouter is acting as a bridge (at layer 3 they're
the same network). Can MyRouter act as firewall and be a bridge?
Because I've done a good job of confusing myself let me ask a really dumb
question. Do you have this working now? My background in network tells me
this shouldn't work. My background in computers tells me that there is a
way to make this work but requires inventiveness on the part of MyRouter.
I have no trouble with everything connected to the hub. My confusion
starts at the MyRouter device, if it is just a router, then this won't
work. If it can firewall/bridge then you're OK. If it's a layer 3 switch/
firwall then you're OK, uhmm I guess ;-). Technology don't you just
love it!
--
Linux Home Automation Neil Cherry ncherry(a)home.net
http://members.home.net/ncherry (Text only)
http://meltingpot.fortunecity.com/lightsey/52 (Graphics)
http://linuxha.sourceforge.net/ (SourceForge)