Re: please advise - problem with routing
From: Dana Brash (dbrash_at_gmail.com)
Date: 10/19/04
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Date: Tue, 19 Oct 2004 15:25:35 +0800
Hi Andrew,
Thanks for the map.
One thing that I would like to make very sure you understand is that when
you add a route, you are not adding it to a network, you are adding it to
the routing table on a host. I realize this may be a language issue, and I
certainly don't mean to criticize at all, but the difference between a host
and a network is a very important distinction in IP address configuration.
On your diagram, you show that the 192.168.1.0/24 subnet has two devices
using the same IP address. You show the NT server as using 192.168.1.1 and
the Router as using 192.168.1.1. This will create terrible conflicts and
nothing should work on that subnet. Each device needs to have a unique IP.
For further troubleshooting, please post back here the results from:
1. ROUTE PRINT on NT4
Please open a command window on the NT4 machine and copy the results of a
ROUTE PRINT and post it back here.
2. ROUTE PRINT on router (or otherwise grab the route table)
What kind of machine is the other Router? Is it also a Windows machine, or
Linux, or hardware appliance, or?
Please post the route table from this device also.
3. tracert -d 192.168.2.2 from host on 192.168.26.0/24 subnet
Finally, from a device on the 192.168.26.0/24 subnet please run a tracert -d
192.168.2.2 command and post the results from that up here as well.
You do not need any additional NIC in this environment, it's all
configuration, not hardware.
I am curious, however, why there is no Internet access shown in the diagram?
Are there possibly some WAN connections in here that are VPN'd or something?
--
HTH,
=d=
Dana Brash
MCSE, MCDBA, MCSA
dbrash@gmail.com
"andrew" <kc2ine@yahoo.com> wrote in message
news:OCEOU2YtEHA.160@TK2MSFTNGP11.phx.gbl...
> Hi Dana,
> here is like it looks:
> _____________
> | video recording dev|
> |____________|
> |
> 192.168.2.2 (static)
> |
> |
> NIC2
> 192.168.2.1
> _|_
> | |
> | | first server (Actually a router also)
> |____| WinNT4.0 IP routing enable (checkbox)
> |
> NIC1
> 192.168.1.1
> |
> 192.168.1.1/24 (in this network I added using route command:)
> ____|______ route add 192.168.2.0 mask 255.255.255.0 192.168.1.1
> and
> works
> | ROUTER |
> |__________|
> 192.168.26.1/24
> |
> |
> 192.168.26.x/24 (no dhcp)
> (from this network main server is accessed through GW 192.168.26.1)
> in that network I cannot of course add gatway 192.168.1.1 directly, and
> thats my problem.
> so how to routr this. without adding additional NIC (not possible)
> thanks, Andrew
>
>
>
>
> "Dana Brash" <dbrash@Phongsaly.com> wrote in message
> news:ehquaSQtEHA.1308@tk2msftngp13.phx.gbl...
>> Hi Andrew,
>>
>> >>I have 2 network 192.168.1.1 and 192.168.26.1 connected together by
>> >> router.
>>
>> Actually, these are HOST addresses, not NETWORK addresses.
>> But working with the concept that we've got two subnets 192.168.1.x/24
>> and
>> 192.168.26.x/24, you could accomplish this a couple different ways. The
>> first diagram below shows a literal interpretation of this statement.
>> The
>> second diagram shows a different way that you could accomplish this.
> These
>> are by no means the only ways to do it....
>> If your config is different, please point out where.
>>
>> >> > On first server 192.168.1.1 I have additional NIC 192.168.2.1 which
> is
>> >> used
>> >> > by some
>> >> > device.
>>
>> What is that device? a printer? Wireless AP? Another comptuer? What is
> it's
>> purpose?
>> Not terribly important, but may be helpful to know...
>>
>> >> >From 192.168.1.1 I can access that device since I checked IP
>> >> routing
>> >> > on that sever
>>
>> Again, I will assume that this means from the 192.168.1.x/24 subnet you
> can
>> access the 192.168.2.x/24 subnet
>> How have you enabled routing on this device? Are you using RRAS? Static
>> Routes?
>>
>> >> > and use 192.168.1.1 as a gateway,
>> As far as I can tell, this HOST IP address should be the private side of
>> your Internet Router, and not related to routing between the two internal
>> subnets
>>
>> >> >but I cannot access that device from
>> > the
>> >> > second 192.168.26.1 network.
>> Right, you need to add the routes.
>>
>>
>> Below are some example setups, but again, I'm not too sure how you've got
>> your topology configured.
>> Again, there are many ways to accomplish what you're trying to do.
>> Please
>> help us understand what you've actually done. Feel free to modify the
>> diagrams to draw us a picture.
>>
>> HTH,
>> =d=
>>
>> --
>> Dana Brash
>> MCSE, MCDBA, MCSA
>>
>> dbrash@gmail.com
>>
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> In this diagram for packets from 192.168.26.x to reach 192.168.2.x, the
>> router needs to have a route entry that directs traffic to the
>> 192.168.2.x/24 network via the 192.168.1.11 Gateway using ETH0
>> ("/24" = "24 bit" = "255.255.255.0" subnet mask)
>>
>> ********************************************************
>> _____________
>> | Some Device |
>> |____________|
>> |
>> 192.168.2.??/24
>> |
>> |
>> NIC2
>> 192.168.2.x/24
>> _|_
>> | |
>> | | first server (Actually a router also)
>> |__|
>> |
>> NIC1
>> 192.168.1.11/24
>> |
>> |
>> 192.168.1.1/24 (let's say ETH0)
>> ____|______
>> | ROUTER |----/\/\/---(ETH2)---/\/\/---->> INTERNET
>> |__________|
>> 192.168.26.1/24 (let's say ETH1)
>> |
>> |
>> 192.168.26.x/24
>> ********************************************************
>>
>>
>>
>> In this diagram for packets from 192.168.26.x to reach 192.168.2.x,
> ROUTER-2
>> will have a Route from 192.168.26.x/24 -> 192.168.2.x/24 via 192.168.1.11
>> Gateway using Interface 192.168.1.12 (RT2_ETH0).
>> There will also be a default route on Router2 that uses ROUTER1 ETH0 as
> the
>> default gateway.
>>
> ===========================================================================
>> ON ROUTER2:
>> Network Destination Netmask Gateway Interface
>> Metric
>> . .
>> 192.168.2.0 255.255.255.0 192.168.1.11
>> 192.168.1.12
>> ??
>> . .
>> Default Gateway: 192.168.1.1
>>
> ===========================================================================
>>
>> ********************************************************
>> _____________
>> | Some Device |
>> |____________|
>> |
>> 192.168.2.??/24
>> |
>> |
>> Server_NIC2
>> 192.168.2.x/24
>> _|_
>> | |
>> | | first server (Actually a router also)
>> |__|
>> |
>> Server_NIC1
>> 192.168.1.11/24
>> |
>> |
>> ____\/____ __________
>> | Switch |--(RT1_ETH0)-->| ROUTER1 | --(RT1_ETH1)----->> INTERNET
>> |________| 192.168.1.1/24 |__________| PUBLIC IP
>> ^
>> |
>> |
>> 192.168.1.12/24(let's say RT2_ETH0)
>> |
>> ____\/______
>> | ROUTER 2 |
>> |__________|
>> |
>> 192.168.26.1/24 (let's say RT2_ETH1)
>> |
>> |
>> 192.168.26.x/24
>> ********************************************************
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>>
>>
>> --
>> Dana Brash
>> MCSE, MCDBA, MCSA
>>
>> dbrash@gmail.com
>>
>> "andrew" <kc2ine@yahoo.com> wrote in message
>> news:%233SjBPLtEHA.2808@TK2MSFTNGP14.phx.gbl...
>> > Hi Mike,
>> > I use gateway 255.255.255.0 in both. The 192.168.26.1 is not on the
>> > server,
>> > this is separated remote network with router( GW 192.168.26.1) The
>> > problem
>> > is what gateway use to get to 192.168.2.1 network. I use 192.168.26.1
>> > GW
>> > to
>> > get to 192.168.1.1 and this work.
>> > The NIC 192.168.2.1 is on the server 192.168.1.1 (second NIC)
>> > thanks, Andrew
>> >
>> > "Miha Pihler" <mihap-news@atlantis.si> wrote in message
>> > news:uh6LV8BtEHA.2660@TK2MSFTNGP12.phx.gbl...
>> >> Hi Andrew,
>> >>
>> >> You haven't told us the subnet mask that you use (in this case, this
>> >> would
>> >> be very important information).
>> >>
>> >> If you decided to use default subnet mask for 192.168.x.x network that
>> > would
>> >> be 255.255.255.0 (or 24 bit subnet mask). If we look at an example one
>> >> subnet would be:
>> >> 192.168.1.1 - 192.168.1.255 with 24 bit subnet mask. Second subnet
> would
>> > in
>> >> this case be
>> >> 192.168.2.1 - 192.168.2.255 with 24 bit subnet mask Third subnet would
> in
>> >> this case be
>> >> 192.168.3.1 - 192.168.3.255 with 24 bit subnet mask ....
>> >> .
>> >> .
>> >> .
>> >> 192.168.26.1 - 192.168.26.255 with 24 bit subnet mask
>> >> .
>> >> .
>> >> .
>> >> 192.168.255.1 - 192.168.255.255 with 24 bit subnet mask.
>> >>
>> >> In this case computers and devices in 192.168.1.x network will need a
>> >> gateway on 192.168.1.x subnet. Computers and devices in 192.168.2.x
>> > network
>> >> will need their gateway on 192.168.2.x subnet or will not be able to
>> > connect
>> >> to 192.168.1.x network (or anything outside 192.168.2.x network). And
>> >> computers and devices in 192.168.26.x network will need their gateway
> on
>> >> 192.168.26.x subnet...
>> >>
>> >> Gateway _must_ always be on same subnet as computers/devices are...
>> >>
>> >> If you have a server with 3 NIC with IPs 192.168.1.1 and 192.168.2.1
> and
>> >> 192.168.26.1 this server will be able to connect to all three networks
>> > (but
>> >> only this server/device). It will use information from the NIC to
>> >> build
> a
>> >> routing table.
>> >>
>> >> Such servers (and Windows computer) can have only one default gateway.
>> > This
>> >> would be the NIC that leads e.g. to the internet. E.g. if your NIC
>> >> 192.168.1.1 would be connected to the router that lead to the internet
>> > this
>> >> NIC would have a gateway.
>> >>
>> >> Mike
>> >>
>> >> "andrew" <kc2ine@yahoo.com> wrote in message
>> >> news:OsVm8RBtEHA.3052@tk2msftngp13.phx.gbl...
>> >> > hi,
>> >> > I have 2 network 192.168.1.1 and 192.168.26.1 connected together by
>> >> router.
>> >> > On first server 192.168.1.1 I have additional NIC 192.168.2.1 which
> is
>> >> used
>> >> > by some
>> >> > device. From 192.168.1.1 I can access that device since I checked IP
>> >> routing
>> >> > on that sever
>> >> > and use 192.168.1.1 as a gateway, but I cannot access that device
> from
>> > the
>> >> > second 192.168.26.1 network. Can somebody help? I cannot use the
> same
>> >> > gateway since this is different network.
>> >> >
>> >> >
>> >>
>> >>
>> >
>> >
>>
>>
>
>
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