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

[Alex Arseniev]

 Florian,
Perhaps a silly question - are these interfaces on the same router?
If yes what you are trying to accomplish is possible with unnumbered
Ethernet interfaces and forwarding-table-filter to prevent hosts talking to
each other.
Start here http://www.juniper.net/techpubs/software/junos/junos84/swconfig84-network-interfaces/id-10413973.html#id-10413973
 and please read the restrictions
http://www.juniper.net/techpubs/software/junos/junos84/swconfig84-network-interfaces/jN212B7.html#jN212B7

Forwarding table filter
http://www.juniper.net/techpubs/software/junos/junos84/swconfig84-policy/id-10824476.html#id-10824476

Rgds
Alex

 On 15/11/2007, Florian Weimer <fweimer at bfk.de> wrote:
>
> 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
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