Newbie:How Connect single NIC laptop to two LANs ?

Discussion in 'Cisco' started by avoidspam, Jun 12, 2004.

  1. avoidspam

    avoidspam Guest

    Hello,

    I need to host a laptop machine on two LANs with seperate Subnets.
    The most obvious answere is to have two NIC/ Ethernet Ports, to
    conect to each netwrok respectively. But I am constrained to a single
    standard Ethernet Port.

    Therefore I think I can solve by using two (NATEnabled) Routers and a
    local hub/switch. Each Router would connect to respective LAN, and
    then I connect the Routers and Laptop together via the Switch/hub. I
    would use the NAT in each Router to set a IP presence of teh Laptop on
    both LANS's.

    I presume this would work at the IP level, and probably at name
    services level.

    However my real question is is there a Router network product that
    combines this configuration into a single unit. (i.e. Basically two
    Routers into a local network. ) I have searched, and can only find
    Multiple WAN to Switch Routers, for the home DSL/Cable market. I
    presume that there would be a generic CISCO Multiple Router product
    but it is not clear what product term I am asking for.

    I am looking for a physically small unit, and I do not need lots of
    features beyond NAT, and I am looking for a physismall unit.)

    Many Thanks for any help

    Julian
     
    avoidspam, Jun 12, 2004
    #1
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  2. avoidspam

    JustMe Guest

    avoidspam wrote:

    > Hello,
    >
    > I need to host a laptop machine on two LANs with seperate Subnets.
    > The most obvious answere is to have two NIC/ Ethernet Ports, to
    > conect to each netwrok respectively. But I am constrained to a single
    > standard Ethernet Port.


    A single ethernet port can have 2 IP address, thus can belongs
    simultaneously to 2 distinct LANs

    >
    > Therefore I think I can solve by using two (NATEnabled) Routers and a
    > local hub/switch. Each Router would connect to respective LAN, and
    > then I connect the Routers and Laptop together via the Switch/hub. I
    > would use the NAT in each Router to set a IP presence of teh Laptop on
    > both LANS's.
    >
    > I presume this would work at the IP level, and probably at name
    > services level.
    >
    > However my real question is is there a Router network product that
    > combines this configuration into a single unit. (i.e. Basically two
    > Routers into a local network. ) I have searched, and can only find
    > Multiple WAN to Switch Routers, for the home DSL/Cable market. I
    > presume that there would be a generic CISCO Multiple Router product
    > but it is not clear what product term I am asking for.
    >
    > I am looking for a physically small unit, and I do not need lots of
    > features beyond NAT, and I am looking for a physismall unit.)
    >
    > Many Thanks for any help
    >
    > Julian
     
    JustMe, Jun 12, 2004
    #2
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  3. avoidspam

    mh Guest

    Does you rlaptop have a USB port?

    If so, then get a USB-to-Ethernet adapter (Linksys, Netgear and others)
     
    mh, Jun 13, 2004
    #3
  4. "avoidspam" <> wrote in message
    news:...
    > I need to host a laptop machine on two LANs with seperate Subnets.


    With what OS? You can set the port to 802.1q mode on some PCs, and attach
    it to a switch in 802.1q more and you can have as many interfaces as you
    like!

    > Therefore I think I can solve by using two (NATEnabled) Routers and a
    > local hub/switch. Each Router would connect to respective LAN, and
    > then I connect the Routers and Laptop together via the Switch/hub. I
    > would use the NAT in each Router to set a IP presence of teh Laptop on
    > both LANS's.


    Too complex!! Thst is not really needed... what are you trying to
    accomplish?

    What kinds of switches do you use, and what OS in the laptop?
     
    Phillip Remaker, Jun 14, 2004
    #4
  5. avoidspam

    AnyBody43 Guest

    JustMe <> wrote
    > avoidspam wrote:
    >
    > > Hello,
    > >
    > > I need to host a laptop machine on two LANs with seperate Subnets.
    > > The most obvious answere is to have two NIC/ Ethernet Ports, to
    > > conect to each netwrok respectively. But I am constrained to a single
    > > standard Ethernet Port.

    >
    > A single ethernet port can have 2 IP address, thus can belongs
    > simultaneously to 2 distinct LANs
    >


    A wee question.
    How can two distinct (i.e. seperate) LANS conenct to a single
    ethernet port.

    As fas as I can see once they are connected to the same ethernet port
    they are no longer distinct.

    Your network administration group may have something to say
    about that.

    If you state your high level requirements someone may be able to help.

    As you say you can do it with a router but you will still need to
    integrate it into the networks routing plan.
     
    AnyBody43, Jun 14, 2004
    #5
  6. avoidspam

    JustMe Guest

    AnyBody43 wrote:

    > JustMe <> wrote
    >
    >>avoidspam wrote:
    >>
    >>
    >>>Hello,
    >>>
    >>>I need to host a laptop machine on two LANs with seperate Subnets.
    >>>The most obvious answere is to have two NIC/ Ethernet Ports, to
    >>>conect to each netwrok respectively. But I am constrained to a single
    >>>standard Ethernet Port.

    >>
    >>A single ethernet port can have 2 IP address, thus can belongs
    >>simultaneously to 2 distinct LANs
    >>

    >
    >
    > A wee question.
    > How can two distinct (i.e. seperate) LANS conenct to a single
    > ethernet port.
    >
    > As fas as I can see once they are connected to the same ethernet port
    > they are no longer distinct.


    it depends what you call distinct. Connectinct 2 LANs to a single
    machine is also a situation where these 2 LANs are no more distinct ;-)



    >
    > Your network administration group may have something to say
    > about that.
    >
    > If you state your high level requirements someone may be able to help.
    >
    > As you say you can do it with a router but you will still need to
    > integrate it into the networks routing plan.
     
    JustMe, Jun 14, 2004
    #6
  7. avoidspam

    paul blitz Guest

    > Therefore I think I can solve by using two (NATEnabled) Routers and a
    > local hub/switch. Each Router would connect to respective LAN, and
    > then I connect the Routers and Laptop together via the Switch/hub. I
    > would use the NAT in each Router to set a IP presence of teh Laptop on
    > both LANS's.


    Why do you need TWO? You could (a) host the laptop on ONE of the addresses;
    (b) have a natted router to connect to the second LAN.

    But as others have noted, you could easily use a second ethernet port via a
    USB / pcmcia slot: this would be far cheaper, and a LOT simpler to set up.


    paul
     
    paul blitz, Jun 14, 2004
    #7
  8. avoidspam

    Jules Guest

    "Phillip Remaker" <> wrote in message news:<iT9zc.2099$>...
    > "avoidspam" <> wrote in message
    > news:...
    > > I need to host a laptop machine on two LANs with seperate Subnets.

    >
    > With what OS? You can set the port to 802.1q mode on some PCs, and attach
    > it to a switch in 802.1q more and you can have as many interfaces as you
    > like!
    >
    > > Therefore I think I can solve by using two (NATEnabled) Routers and a
    > > local hub/switch. Each Router would connect to respective LAN, and
    > > then I connect the Routers and Laptop together via the Switch/hub. I
    > > would use the NAT in each Router to set a IP presence of teh Laptop on
    > > both LANS's.

    >
    > Too complex!! Thst is not really needed... what are you trying to
    > accomplish?
    >
    > What kinds of switches do you use, and what OS in the laptop?


    I am running Windows 2000 Pro on the Laptop

    I guess I need to read up on 802.1q, and what it can do for me. We
    were using basic Level 2 switches for our two LANS. So does your idea
    mean that I connect my Laptop to a 802.1q capable switch, from which I
    take two ports to connect to each of my two LAN switches ? A presume
    connecting both LANS to the same switch will not mess them up ?

    I am trying to connect a Laptop with only a single Ethernet LAN, to
    two physically distinct LANs, and have an IP network presence on btoh.
    I am prevented from adding additional NIC or USB/Ethernet adapter,
    which is the most obvious answer.

    Julian
     
    Jules, Jun 15, 2004
    #8
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