Thought I'd jump in here: If you're iSeries does the DHCP and DNS an is running at least v5r1...Dynamic DNS is easy: http://publib.boulder.ibm.com/iseries/v5r2/ic2924/index.htm Prior to that, to do dynamic or "pseudo-dynamic" DNS for a network you needed to handle DCHP and DNS on a Windows or Unix/Linux box. Windows offered a "pseudo-dynamic" DNS at least as far back as Windows NT 4. 0 I say "pseudo-dynamic" because it was really a DNS/WINS integration that did dynamic DNS (WINS really) updates only for Windows based PC. Windows 2000s Active Directory allowed for true dynamic updates. HTH, Charles > -----Original Message----- > From: Scott Klement [mailto:klemscot@xxxxxxxxxxxx] > Sent: Wednesday, March 03, 2004 1:05 PM > To: Midrange Systems Technical Discussion > Subject: Re: Finding a specific PC IP address when > dynamically assigned > > > > On Wed, 3 Mar 2004, Ian Patterson wrote: > > > We have an application using Scott's Socktut examples to > exchange data > > between an iSeries program and our own PC program. > > Works a treat when we know the IP address of the specific > PC that runs our > > program. > > > > In a network where the PC's have dynamically assigned IP > addresses (from the > > iSeries), is there any way to identify the IP address of a > particular PC ? > > Well, first you have to decide how you're going to refer to > the PCs when > you don't know their IP address... obviously you can't say to the > computer "hey, what's the address of that PC over by the > water cooler?" > > I can think of two ways to refer to a PC when you don't know it's IP > address, you can give it a name via DNS, or you can refer to it by MAC > address. > > The better of the two is to use dynamic DNS. Dynamic DNS > means that your > DHCP server updates the DNS server each time an IP address > changes. If > you have a computer called "Ian" (for example) and the DHCP > server changes > Ian's IP address, it also tells the DNS server about the > change so that > the DNS server will return the new IP address. > > Then, your programs don't have to worry about what the IP > address is, they > just call gethostbyname() on the word "Ian" and the system > does the work. > > Unfortunately, I've never used an iSeries for DHCP or DNS, so > I don't know > what the exact configuration directives to set up DHCP & > dynamic DNS are. > > The second alternative is to look up the MAC address of the PC in the > iSeries' ARP cache. This is a much uglier solution, and > will only work > if all of the PCs are on the same physical network with the iSeries. > (Though, presumably they are if the iSeries is providing DHCP) > > There's an API that can be used to list out the ARP cache, I > know I posted > a sample program that uses that API somewhere... you might > try searching > the web. > > Good Luck > > _______________________________________________ > This is the Midrange Systems Technical Discussion > (MIDRANGE-L) mailing list > To post a message email: MIDRANGE-L@xxxxxxxxxxxx > To subscribe, unsubscribe, or change list options, > visit: http://lists.midrange.com/mailman/listinfo/midrange-l > or email: MIDRANGE-L-request@xxxxxxxxxxxx > Before posting, please take a moment to review the archives > at http://archive.midrange.com/midrange-l. >
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