Patrik Schindler wrote:

I’m a bit confused by this text snippet, taken from


[LCS]

"Rather than a point-to-point link this emulation creates a virtual
Ethernet adapter through which the guest operating system running
in the Hercules Machine can communicate. As such this mode is not
limited to TCP/IP traffic but will in fact handle any Ethernet frame.
Please note that the SNA mode is currently not implemented."

Is there some more precise information about this claim and its origin?

As far as I know, Ethernet is protocol-agnostic.

Correct. But the way LCS devices are designed (or more specifically, the way LCS devices are implemented in Hercules), Hercules needs to be able to recognize SNA packets so it can deliver them to the proper LCS port:




HTH!

--
"Fish" (David B. Trout)
Software Development Laboratories

mail: fish@...

Dear fellow readers,

I’m a bit confused by this text snippet, taken from

[LCS]
Rather than a point-to-point link this emulation creates a virtual Ethernet adapter through which the guest operating system running in the Hercules Machine can communicate. As such this mode is not limited to TCP/IP traffic but will in fact handle any Ethernet frame. Please note that the SNA mode is currently not implemented.

Is there some more precise information about this claim and its origin? As far as I know, Ethernet is protocol-agnostic.

Thanks!

:wq! PoC

Hello Rahim,

thanks for your hints.


Am 21.01.2021 um 20:32 schrieb Rahim Azizarab via groups.io <rahimazizarab@...>:

It is not running, but it is almost there.

Are you talking about yourself?

You may want to search TUN/TAP; and ARP.

This is a very broad topic. Tun is a point-to-point interface and does not utilize ARP at all. May I ask for more details what exactly you’re referring to?

I think you need to start ARP which assigns the MAC address.

ARP does not assign any MAC. Maybe you want to read

There is write up for it on the internet.

openvpn --mktun --dev tun0 --group hercules
ifconfig tun0 192.168.2.65 pointopoint 10.0.0.33
echo 1 >/proc/sys/net/ipv4/ip_forward

As Grant already said, this is for tun only, not for tap. And you don’t need to install openvpn for that. The same goal can be achieved with already system provided tools.

/sbin/ip tuntap add group hercules

I’ve this one already running. :-)

sudo tunctl -u rahim -p
sudo ifconfig tap0 192.168.122.2 up
sudo route add -host 192.168.122.2 dev tap0
sudo bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
sudo arp -Ds 192.168.122.2 tap0 pub
sudo echo "1" > /proc/sys/net/ipv4/conf/tap0/forwarding

I’m not primarily interested in running IP over TAP, but raw ethernet frames (802.2 DLC).

Besides that, I’ve never really understood how proxy arp configuration works within Linux. It’s easier with Cisco IOS. :-)

:wq! PoC

Drive by comment.

On 1/21/21 12:32 PM, Rahim Azizarab via groups.io wrote:

openvpn --mktun --dev tun0 --group hercules
??? ifconfig tun0 192.168.2.65 pointopoint 10.0.0.33
??? echo 1 >/proc/sys/net/ipv4/ip_forward

The tun0 device above is not the same as the tap0 device below.

sudo tunctl -u rahim -p
sudo ifconfig tap0 192.168.122.2 up
sudo route add -host 192.168.122.2 dev tap0
sudo bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
sudo arp -Ds 192.168.122.2 tap0 pub
sudo echo "1"? > /proc/sys/net/ipv4/conf/tap0/forwarding

--
Grant. . . .
unix || die

Hello Rahim,

Am 21.01.2021 um 15:28 schrieb Rahim Azizarab via groups.io <rahimazizarab@...>:

A TAP connection would be an LCS adaptor.

Yap. Do you have an actual running example?

I added an LCS device to hercules.cnf per configuration settings gleaned from the installation, (?VTAM 3172 emulation“) without further parameters.

After firing up Hercules, but before OS IPL, I created a bridging device to connect the hercules-made tap0 to eth0 (an unused NIC in the machine, so I fire it up with ifconfig to have it in running state).

brctl addbr br0
ifconfig eth0 up
brctl addif br0 eth0 tap0

May I ask you for confirmation about that the Linux side seems right?

In VTAM one would need some thing like the following in VTAMLST.

Thanks! I’m not yet this far. I see there is already an example (?) configuration for a type XCA.

:wq! PoC

Dear readers,

did somebody successfully configure VTAM on MVS or successors to actually make a connection via 802.2 DLC over a TAP device in Linux, bridged to a physical NIC? Maybe to an MS SNA server for a start. If yes, I’d appreciate a pointer to a how-to or other documentation.

I’m specifically *not* talking about EE.

(Aside from ?learn VTAM“, which is a very broad topic and a bit too generic for my question. :-) )

Thanks!

:wq! PoC

开云体育

Look for gc28-0629-1 on bitsavers. I think it’s the ibm/370/os_vs2/release 3.7 directory. Read the section on pre-prompt exit

开云体育

Thanks to all who responded to my query about logon procs.? I was able to use the ACCOUNT command to add the ISPLOGON proc to my userid in SYS1.UADS.? (That ACCOUNT command ought to be a prime candidate for the computer command with the most obtuse syntax ever devised!)

While we are on the subject of logon procs, I once again have access to a real IBM MVS system running z/OS.? When I logon to that system, I enter my userid and then I am presented with the following panel:

The values displayed in those fields are remembered from one logon session to the next.

Is there any way our MVS 3.8j system can be configured to operate like that?? Can it be done with some VTAM programming or some such?
(Since the title at the top of that screen says "TSO/E LOGON" I'm guessing that the answer is "no".)

Charles Bailey

开云体育

You will need to use the ACCOUNT command from either HERC01 or HERC02 as they have OPER privileges.

Just a small nitpick - the ACCT privilege is required by a user ID to issue the ACCOUNT command.

For those who aren't long term TSOers, the 4 general privilege settings associated with a TSO user ID are:

• ACCT / NOACCT - controls the ability to use the ACCOUNT command.
• OPER / NOOPER - controls the ability to use the OPERATOR (or OPER for short) command.
• JCL / NOJCL - controls the ability to use the FIB (foreground initiated background) commands of STATUS (ST), SUBMIT (SUB), OUTPUT (OUT) and CANCEL.
• MOUNT / NOMOUNT - controls whether the TSO session will issue a console mount request when an attempt is made to allocate a data set on an unmounted volume.? These mount requests are actually IEF455D WTOR messages meaning that the operator has the option of replying NO to deny the allocation request.

(BTW, commands such as ACCOUNT, OPERATOR, OUTPUT, TEST and EDIT (and PDS which is not from IBM) are examples of commands which process subcommands.? When these commands are active, the mode prompt is not READY but the name of the command, except for when EDIT is in input mode, where the prompt is INPUT.)

Having the MOUNT attribute means that it is fairly easy to browse tape data sets, especially if they are cataloged because you don't even have to supply the UNIT and VOLUME, nor contrive to supply the file sequence number.

The REVTAPE CLIST uses the ALLOCATE command to supply the file sequence number.

Yes, REVIEW does provide the same up and down scrolling control for tape data sets as it does for DASD data sets.? Have fun trying to scroll up to a previous volume - this used to not work when it would apply TTRs from earlier volumes to the current volume, but these days it may request the operator to re-mount the first volume - can't say for sure because I haven't tried it.? (The last time I regularly used tapes was 2002.)

Of course, having the MOUNT attribute means that if you mistype the volume serial you'll often end up with a hanging mount request, so on real systems where I am not the operator I like to run with NOMOUNT most of the time.? If I ever need MOUNT I just zap the bit on for that session.? IM VB has the MNT and NMNT commands to facilitate this.

Cheers,
Greg

开云体育

Charles,

This is my fault for not documenting how to authorize a user to use a new logon proc, and I will update the documentation in the next release

.

As a good practice, the key SYS1 datasets such as 'SYS1.PROCLIB' are generally reserved for IBM provided materials, I recommend you place the proc in 'SYS2.PROCLIB' which exists for this purpose.

Wally

This is how to authorize a TSO user to use a new logon proc.

Logon as user HERC01 which is authorized to use the ACCOUNT command.

Allocate the UADS file using -

ALLOC F(SYSUADS) DA('SYS1.UADS') SHR

Enter the ACCOUNT command -

ACCOUNT

List the userid to display its current logon proc -

L (HERC03)

This will produce a display something like -

??? HERC03?? USER ATTRIBUTES:? NOOPER? NOACCT??? JCL? NOMOUNT??

???????????? INSTALLATION ATTRIBUTES, IN HEX: 0000?????????????

???????????? MAXSIZE: NOLIM????????????????????????????????????

???????????? USER PROFILE TABLE:???????????????????????????????

???????????? 00000000000000000000000000000000 HERC03???????????

???????????? DESTINATION? =? CENTRAL SITE DEFAULT??????????????

???????????? NO PERFORMANCE GROUPS?????????????????????????????

????? (*)??????????????????????????????????????????????????????

??????? (*)????????????????????????????????????????????????????

????????? TSOLOGON? PROCSIZE=? 8192K, UNIT NAME= TSO???????????

?IKJ56590I LISTED??????????????????????????????????????????????

??????????????????????????????????????????????????????????????? ???????????????????????????????????????????????

Then using the TSO ACCOUNT command, you need to change the PROC name for the user as follows:

C?? (HERC03 * * TSOLOGON)? DATA(ISPLOGON) /* note the highlighted old procname must match the highlighted procname for the user.

END

On 16/01/2021 21:16, Charles Bailey wrote:

I am running tk4-.? It appears that the default TSO logon proc is TSOLOGON and when a user logs on the JCL in SYS1.PROCLIB(TSOLOGON) is executed.

I recently installed Wally's ISPF.? I copied ISP.V2R1M0.INSTALL(ISPLOGON)? to SYS1.PROCLIB and customized a few dataset names.? Now, when I try to logon with this new logon proc I get the following messages:
Logon ===> HERC03 PROC(ISPLOGON)

?ENTER CURRENT PASSWORD FOR HERC03-

?PROCEDURE NAME ISPLOGON NOT AUTHORIZED
?REENTER -

and the only way I can proceed is to enter TSOLOGON as the procedure name.

How can I tell TSO that the procedure ISPLOGON is also authorized?

Assuming you followed the installation instructions to the letter did you make changes to all for TK4 ?

IF not and you don't know ask the TK4 author.

I am running tk4-. It appears that the default TSO logon proc is TSOLOGON and when a user logs on the JCL in SYS1.PROCLIB(TSOLOGON) is executed.

I recently installed Wally's ISPF. I copied ISP.V2R1M0.INSTALL(ISPLOGON) to SYS1.PROCLIB and customized a few dataset names. Now, when I try to logon with this new logon proc I get the following messages:
Logon ===> HERC03 PROC(ISPLOGON)

ENTER CURRENT PASSWORD FOR HERC03-

PROCEDURE NAME ISPLOGON NOT AUTHORIZED
REENTER -

and the only way I can proceed is to enter TSOLOGON as the procedure name.

How can I tell TSO that the procedure ISPLOGON is also authorized?

Thanks,
Charles Bailey

The track number in MVS 3.8 is 16 bit signed. Patched for TK4- for
unsigned. IBM had to fix it for when 3390-2s came out later.

--
Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?

On 1/12/21 2:54 PM, Mike Schwab wrote:

POs are 16 extents, 1 volume. 1 volume limited to 32K tracks TK3
(3390-1.9) or 64K tracks TK4- (3390-3.8)
PS are 16 extents 4GB.

That's 16 extents per volume.? Default (for example, on tape) is six volumes; you can raise the limit.

Most older types (3380 and older?) are smaller than 4 GB.? Where does that limit come, and is per volume or per dataset?

VSAM 4GB over 12x extents 59 volumes.

On Tue, Jan 12, 2021 at 4:20 PM Mark Waterbury
<mark.s.waterbury@...> wrote:

Does anyone recall the maximum size of files (PS, PO, DA, and VSAM) that can be created in MVS 3.8J?

Also, considering that 3380 and 3390 support have apparently been "retrofitted" to the TK4- version ...

Thanks in advance.

--
Drew Derbyshire

WNTC radio - Why Not Try Clyde?

POs are 16 extents, 1 volume. 1 volume limited to 32K tracks TK3
(3390-1.9) or 64K tracks TK4- (3390-3.8)
PS are 16 extents 4GB.
VSAM 4GB over 12x extents 59 volumes.

On Tue, Jan 12, 2021 at 4:20 PM Mark Waterbury
<mark.s.waterbury@...> wrote:

Does anyone recall the maximum size of files (PS, PO, DA, and VSAM) that can be created in MVS 3.8J?

Also, considering that 3380 and 3390 support have apparently been "retrofitted" to the TK4- version ...

Thanks in advance.

--
Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?