[j-nsp] Point-to-point Ethernet interfaces

[Florian Weimer]

Is it possible to put an Ethernet interface into point-to-point with
JUNOS 8.4?

Basically, the setup I want is:

  ge-0/0/0 (172.16.1.1) -> hostA (172.16.1.2)

  ge-0/0/1 (172.16.1.1) -> hostB (172.16.1.3, 172.16.1.4)

  ge-0/0/2.102 (172.16.1.1, 802.1q tagged) -> hostC (172.16.1.5)

The router uses ARP to obtain MAC addresses for the host IP addresses,
and answers ARP requests for the 172.16.1.1 address.  Proper
interface/VLAN separation must be maintained.

The rationale is address space conservation and easier documentation.
/30 routes don't work in hostB's case, where more than one address is
required.  (So we need something between 4 and 6 as much IP addresses
as strictly necessary.)  I haven't checked if /31 interfaces work, but
in any case, they require host-specific default gateways, making
documentation slightly more difficult.

Any suggestions?  I know that the desired setup isn't strictly allowed
by the standards, but it works quite well with various systems, and
the address space savings are quite nice.

-- 
Florian Weimer                <fweimer at bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99