Re: Reverse IP NAT to secondary IP address

_at_babolo.ru
Date: 10/26/03

  • Next message: Nils Vogels: "Re: Reverse IP NAT to secondary IP address" 
    To: Nils Vogels <nivo+dated+1067540755.d82241@yuckfou.org>
Date: Sun, 26 Oct 2003 03:32:28 +0300 (MSK)

    [ Charset ISO-8859-1 unsupported, converting... ]
    > Hi there!
    >
    > I'm trying to solve a situation that I have with a device which needs
    > SNMP polling, but is not normally reachable to the outside world,
    > because it cannot install a default gateway.
    >
    > In short, a situation scetch:
    >
    >
    >
    >
    > SNMP-server (192.168.2.2/24)
    >
    > -----------
    > +------------+ +-------------+
    > |
    > | WWW |--------------------| Gateway | --------------+
    > +------------+
    > +-------------+ |
    > 192.168.0.2/24 192.168.0.1 IP: 195.x.x.x.x
    > \-----> Internet (0.0.0.0/0)
    > (rl0) Alias:
    > 192.168.2.1
    >
    > (ed0)
    >
    > Now what I am trying to do is get statistics from the SNMP-server into
    > the WWW box, but I am stuck on the following:
    >
    > WWW is a FreeBSD-4.8 box.
    > Gateway is a FreeBSD-4.8 box with IP Filter
    > Since the SNMP-server does not have a default route, the traffic needs
    > to originate from an IP address within the same subnet as the Gateway.
    > To that end, I have added an alias IP of 192.168.2.1 to the gateway.
    > When I run an snmpwalk from the gateway all goes fine.
    >
    > Since the traffic is coming from WWW and heading through the Gateway,
    > which does not bridge, I have to perform some form of NATting in the
    > gateway.
    >
    > I've been searching and attempting various redirects and map entries,
    > and am now stuck at:
    >
    > map rl0 from 192.168.0.0/24 to 192.168.2.0/24 port = 161 -> 192.168.2.1/32
    >
    > I think I'm close .. can someone give me the final hint ? ;-)
    configure port with SNMP-server as 192.168.0.17/30 for example
    instead 192.168.2.1/24, and
    sysctl net.link.ether.inet.proxyall=1

    and configure SNMP-server as 192.168.0.18/24

    If you can change mask of SNMP-server, you can
    use 192.168.0/24 and 192.168.1/24 on gateway
    and 192.168.0/25 on SNMP-server.

    No NAT is needed.

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  • Next message: Nils Vogels: "Re: Reverse IP NAT to secondary IP address"

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