Hal,
check IMPP GC28-6865, there are recommendations regarding HMC
connectivity. You can also check HMC chapter in SG24-7515 redbook (z10
EC Technical Guide).

Marian Gasparovic
IBM Slovakia

On Thu, Mar 5, 2009 at 5:42 PM, Hal Merritt <[email protected]> wrote:
> Is this recommendation documented anywhere?
>
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
> Of Patti Neuman
> Sent: Thursday, March 05, 2009 10:35 AM
> To: [email protected]
> Subject: Re: z/10 HMC/SE LAN
>
> As far as I can tell, communications between the HMC and the SE is TCPIP
> based.  We kept the IBM switch for the private lan between the HMC and the
> SEs.  We added our own hub using the second NIC and a public IP address.
> This was the recommended method from IBM - two separate networks.  We
> didn't open our firewall so the HMC isn't accessible from outside. Instead
> I use a VPN so I am on our internal network and access the HMC website via
> that.  I hope this helps.
>
>
> Patti Neuman                                   OCM BOCES CNYRIC
> Sr. Systems Programmer                        PO Box 4866
> Technical Support                             Syracuse, NY  13221
>
> Phone (315) 433-8304                    FAX  (315) 433-8368
>
>
>
> From:
> Hal Merritt <[email protected]>
> To:
> [email protected]
> Date:
> 03/05/2009 10:43 AM
> Subject:
> z/10 HMC/SE LAN
> Sent by:
> IBM Mainframe Discussion List <[email protected]>
>
>
>
> Any idea what protocol is used on the z/10 HMC / SE LAN? My CE wasn't
> sure, but he was thinking it was -not- TCP/IP.
>
> My network folks want to replace the IBM supplied Ethernet switch with a
> firewall/router  appliance.  The business need is to access the web server
> on the HMC for remote operation, and the way we did that on the outgoing
> machine was to  just tap into that LAN. I'd prefer we kept out of that LAN
> and use the second NIC on the HMC.
>
>
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