Re: TCPIP Profile (GATEWAY vs BEGIN/ENDROUTES)

Scott,

I'm not at all sure I understand the rationale for your request.

GATEWAY is the old, old way of doing it, the understanding of which was some
sort of rite of passage for the acolytes of TCP/IP for MVS. One well-known
regular contributor to this group/list - in another forum many years ago -
said his networking people fell about laughing when he finally managed to
explain how this statement worked - and one can sympathise with their
merriment.

BEGINROUTES/ENDROUTES is the "modern" way of defining static routes is the
present incarnation of TCP/IP for MVS, namely Communications Server IP. This
aligns much more closely with the way static routes are defined in all the
platforms I have come across - including this Windows PC.

I wish I still had the schematic I created for my forum colleague who
prompted the hilarity when he passed it on.

Let us assume your destination is a subnet with address 10.22.33.0 with a
subnet mask of 255.255.255.0. Do you remember learning about networks when
you first encountered TCP/IP? Well that's the thing you have to put in the
first column. Thus the network is 10, a class A net. First Hop is where you
provide the address of the adjacent router on the way to the destination or
"=", Link Name is the name of your LINK statement, Packet Size is what it
says and 1500 is good for one of the Ethernet flavours, Subnet Mask is
0.255.255.0, in other words, that part of the subnet mask not already
determined by the class of the net (which is, as I'm sure you remember,
255.0.0.0 - you see combining the two 255.0.0.0 and 0.255.255.0 makes
255.255.255.0) and, finally, Subnet Value is 0.22.33.0 ( again, combining
the two, 10.0.0.0 and 0.22.33.0 makes 10.22.33.0). QED but about as obsolete
as Noah's Ark.

If you have a class B net the split is two bytes of network and two bytes
where you sort out the subnet. If you have a class C network the split is
three bytes of net and one byte where you sort out the subnet.

If it's still as clear as mud, you'd better provide your actual address
slightly, but only very slightly, changed to protect the innocent. We do
need to be able to work out the correct class of network.

Reviewing, do you imagine you need to retain the GATEWAY statements for some
reason. It would be much better if you took the opportunity to convert the
1.6 system to BEGINROUTES/ENDROUTES while you have the chance. If you can do
that, I hope there's enough information here to make the translation. If
not, please post again with those statements and someone will convert them
for you - if there are not too many.

Chris Mason

----- Original Message -----
From: "Scott Harder" <Scott.Harder@xxxxxxxxxxxx>
Newsgroups: bit.listserv.ibm-main
To: <IBM-MAIN@xxxxxxxxxxx>
Sent: Friday, 31 March, 2006 8:42 PM
Subject: TCPIP Profile (GATEWAY vs BEGIN/ENDROUTES)


Hello List,

I am hoping someone here can help me, although I realize that I should
probably post this on the TCPIP list, of which I am not subscribed to a
the
moment. I am upgrading a release of z/OS ADCD (1.5 to 1.6) and I am
customizing the TCPIP profile for v1.6. The v1.5 TCPIP profile used
BEGINROUTES/ENDROUTES, but the one for the v1.6 system doesn't even have
those as examples - it only has the GATEWAY (with DEFAULTNET). So... I'm
flexible... I figured we will go ahead and use GATEWAY. My only problem
is
that I have no earthly idea what the "Subnet Value" should be. I've
pasted
the GATEWAY statement from the 1.6 system below. If anyone can help or
point me in the right direction, I would be eternally grateful.

GATEWAY
; Network First Hop Link Name Packet Size Subnet Mask
Subnet Value
xxx.xxx.xxx.0 = ETH1 1500
255.255.255.0 ?????????

All the best,

Scott Harder
ASPG, Inc.

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