[ANSS-netops] Operating multiple reftek recorders behind a single static IP. (fwd)

[Stephen Brewer]

Thanks to everyone for your replies to this. The conclusion seems to be 
a simple one. The DSL modem or router is configured to forward incoming 
traffic to individual refteks, at different port numbers. The outgoing 
udp traffic from the refteks to a remote rtpd, will still use port 2543, 
and come from the single public IP address, but rtpd will distinguish 
which data is from which recorder.

No elaborate port #1 to port 2543 incoming, followed by port 2543 to 
port #1 outgoing, translation is needed.

Thank you everyone for your help, steve.

On 7/6/2011 7:11 AM, mwithers at memphis.edu wrote:
> I'm not even sure that this is true that we won't be able to use a direct
> rtpd connection.  When I look at the rtpd web interface, I'm allowed to
> put in whatever port I want and can choose direct or rtpd independently.
> With the correct natp on the router, the reftek will still see traffic
> directed to its ip on 2543.
>
> Mitch
>
> Center for Earthquake Research and Information (CERI)
> University of Memphis                Ph: 901-678-4940
> Memphis, TN 38152                   Fax: 901-678-4734
>
>
> ---------- Forwarded message ----------
> Date: Tue, 5 Jul 2011 15:39:18 -0500
> From: Antonio Sanchez<A.Sanchez at reftek.com>
> To: Dave Drobeck<drobeck at seis.utah.edu>,
>       "Stephen I Brewer (sbrewer1)"<sbrewer1 at memphis.edu>
> Cc: "anss-netops at geohazards.usgs.gov"<anss-netops at geohazards.usgs.gov>
> Subject: Re: [ANSS-netops] Operating multiple reftek recorders behind a single
>       static IP.
>
> Dear Friends,
>
> Any of the routers listed will do,  I just wanted to add a little bit
> more on the NAPT non NAPT routers.
>
> The key here is that for the REF TEK's the destination port for data
> will always be 2543 but the source port created is different for each
> one of them and that is something the router will handle automatically.
> That port will remain open to receive acknowledgements and other details
> for a certain period of time, so that answers the question of several
> 130's behind the same DSL IP,  no need to do anything,  just plug them
> in the ports with the defined LAN addresses and ready to use.
>
> For command and control of the REF TEK's you could use RTCC but will
> have to do an RTPD connection,  not a direct connection.
>
> If you want to have command and control of the REF TEK's with a direct
> connection, you will have to create several NAPT rules for each one of
> them at different ports,  same for ftp.
>
> Thanks a lot
>
> Antonio Sanchez
> REF TEK Customer Support
> http://www.reftek.com
> Tel : 214-440-1271
>
>
>
>
>
> -----Original Message-----
> From: anss-netops-bounces at geohazards.usgs.gov
> [mailto:anss-netops-bounces at geohazards.usgs.gov] On Behalf Of Dave
> Drobeck
> Sent: Tuesday, July 05, 2011 3:26 PM
> To: sbrewer1 at memphis.edu
> Cc: anss-netops at geohazards.usgs.gov
> Subject: Re: [ANSS-netops] Operating multiple reftek recorders behind a
> single static IP.
>
> Hi Steve,
> We have multiple locations with multiple dataloggers behind one IP -
> just not multiple Refteks for the reason you state - everything is UDP
> 2543.  Need somebody smarter than me to figure that one out.  The router
>
> we use for port translation is
>
> http://www.cdwg.com/shop/products/Cisco-RV042-4-port-10-100-VPN-Router-D
> ual-WAN/654632.aspx
>
> it's been very reliable for us, and listed here as $170.  If you need
> more physical ports a switch can be inserted.
>
> Dave
>
> Stephen Brewer wrote:
>> Hello, I would like to ask how others may have dealt with this.
>>
>> We have a situation which calls for the operation of several refteks,
>> behind a single static IP, DSL service. It is my understanding that
> the
>> port numbers used for communication with the refteks, are not
>> configurable. Is this really the case? If communication port numbers
>> could be changed, the problem would be solved.
>>
>> Another possibility would be to place some sort of router/firewall,
>> capable of port translation, between the DSL modem and refteks.
>> Has anyone ever done anything like this?
>>
>> We have some small experience here, with the CISCO ASA5505 (Adaptable
>> Security Appliance). This is a small, 8-port router/firewall, that I
>> think would be capable of doing the port translation. The cost of such
> a
>> unit though is about $600. Is anyone aware of a cheaper, more
> "consumer"
>> grade product that could do this?
>>
>> A related question. Are the port numbers used by the various outside
>> programs that talk to the reftek configurable?
>> If not, then a similar firewall/router would be required at both ends.
>>
>> Any thoughts or suggestions are appreciated.
>>
>> thanks, steve.
>>
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-- 
Stephen Brewer   University of Memphis /ceri
                  3890 Central Ave
                  Memphis, TN 38152
email: sbrewer1 at memphis.edu
voice: (901) 678-4732   fax: (901) 678-4734