Chuck: Good question. How is multi-homing handled?
The web server can listen on multiple IP addresses but I've never seen anything that discusses how the application/data server handles that. -- Douglas von Roeder 949-910-4084 On Thu, Jun 4, 2020 at 7:47 AM Chuck Miller via 4D_Tech < [email protected]> wrote: > OK I guess some more info may help. It seems that if I have a server that > I run at client with their IP address scheme and then run same structure on > server in my office it shows as broadcasting on more than one IP address. > So the question now is where does 4D get IP address to show on the server > admin window? I think this might be part of the problem. I am going to post > this on the new forum as well with some screen shots > > Regards > > Chuck > > ------------------------------------------------------------------------------------------------ > Chuck Miller Voice: (617) 739-0306 > Informed Solutions, Inc. Fax: (617) 232-1064 > mailto:cjmiller<AT SIGN>informed-solutions.com > Brookline, MA 02446 USA Registered 4D Developer > Providers of 4D and Sybase connectivity > http://www.informed-solutions.com > > ------------------------------------------------------------------------------------------------ > This message and any attached documents contain information which may be > confidential, subject to privilege or exempt from disclosure under > applicable law. These materials are intended only for the use of the > intended recipient. If you are not the intended recipient of this > transmission, you are hereby notified that any distribution, disclosure, > printing, copying, storage, modification or the taking of any action in > reliance upon this transmission is strictly prohibited. Delivery of this > message to any person other than the intended recipient shall not > compromise or waive such confidentiality, privilege or exemption from > disclosure as to this communication. > > > On Jun 4, 2020, at 7:20 AM, Chuck Miller via 4D_Tech < > [email protected]> wrote: > > > > Thanks for input. I will address each below your response > > > > Sent from my iPhone > > > >> On Jun 4, 2020, at 1:44 AM, Chip Scheide <[email protected] > <mailto:[email protected]>> wrote: > >> > >> Chuck, > >> There are 2 ways to resolve this, and using both is probably best. > >> (following assumes DHCP) > >> > >> 1 - put a battery on the computer (server) so that when power goes down > during tests the computer does not turn off. > >> 1a - if this is already the case (it should be if it is a server) and > IP addresses are being changed on the server then there is a switch in the > network who's battery has failed - and Enterprise IT should track it and > fix it ( might need to enter a ticket) > >> > > There is a UPS. Indeed the machine and server never went down > > > > > >> 2 - talk with the IT/network people, give them the server's MAC ID > (network card ID) and request a fixed IP address server through DHCP > >> Notes on #2 : the network admin can assign a specified IP address to a > specific MAC address, which is assigned via DHCP, then regardless of power > outage, server reboot, etc and generally the time off the network, the IP > address of the computer does not change. > > This is the setup. Indeed the IP is manual. > >> > >> and BTW > >> - MAC is a network card term and refers to the network card's ID > >> - Mac(intosh) is an Apple Computer Co. computer. > >> > >> DHCP with manual address usually means that the IP address has been > assigned by specific computer Admin, rather than network admin. The IP > address assigned this way can (and appears to) conflict with the DHCP > server assigning addresses. > >> This is because, as I understand it, the DHCP server does not 'know' > about the manual address. > > The address is permanent and was assigne by network folks > > > > > > > > > >> > >> Quickly: > >> DHCP hands out IP addresses in a specified range xxx.xxx.xxx.1 - 255. > the range can be restricted, say xxx.xxx.xxx.100 - 200. > >> and/or the DHCP server can hand out specific IP addresses to specified > MAC address, and random to all others. > >> Where I was working, IT did all of this. > >> Servers, and other devices which required that IP address NOT change > over time, (requested to be fixed), were assigned in the range 1- 30, 31 - > 220 were for network attached devices (computers, tablets etc), and 220 - > 254 were for reserved for printers. > >> However, ALL addresses were assigned via DHCP - assigning a manual > address was not allowed because: > >> the DHC server did not know about it, and could/would hand out the > manual IP address to another device - creating a conflict. > >> > >> > > Just a note. DHCP with manual address must used a fixed up S far as I > know or you will get conflicts with other machines > >> Hope this helps > >> > >> Chip > >> > >> > >>> Hi All, > >>> > >>> We have a built Client server v 16.x running on a MAC > >>> > >>> Network set up is > >>> DHCP with manual address > >>> > >>> This has been working till about 6n months ago. > >>> > >>> The hospital seems to test power outages on fairly regular basis. > >>> When they do change over to emergency power > >>> > >>> The network pane in system preferences loses all except the IP > >>> address and her we go > >>> > >>> The 4D server running starts listening on a different IP address. Has > >>> anyone ever seen this before. Tech support is telling me to switch to > >>> manual address. > >>> > >>> I have run and used this setup at many other customers > >>> > >>> Thanks and regards > >>> > >>> Chuck > >>> > ------------------------------------------------------------------------------------------------ > >>> Chuck Miller Voice: (617) 739-0306 > >>> Informed Solutions, Inc. Fax: (617) 232-1064 > >>> mailto:cjmiller<AT SIGN>informed-solutions.com > >>> Brookline, MA 02446 USA Registered 4D Developer > >>> Providers of 4D and Sybase connectivity > >>> http://www.informed-solutions.com > >>> > ------------------------------------------------------------------------------------------------ > >>> This message and any attached documents contain information which may > >>> be confidential, subject to privilege or exempt from disclosure under > >>> applicable law. These materials are intended only for the use of the > >>> intended recipient. If you are not the intended recipient of this > >>> transmission, you are hereby notified that any distribution, > >>> disclosure, printing, copying, storage, modification or the taking of > >>> any action in reliance upon this transmission is strictly > >>> prohibited. 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