Hercules networking redux

Hi. I'm currently running z/OS 2.10.00 under Hercules 4.0.0.0 on MacOS
Mojave (10.14.5). Like many others I'm running into network problems. As
well like many others I've read this forum and whatever information I can
find on line, but so far without success. Now having said that, networking
will occasionally work, but I can't for the life of me figure out why. I'll
show you what I can, but I'm hoping that there's some easy solution that
I'm missing or (more likely) overlooked.


First, I've got tun/tap installed:


508> ls /dev/tun*

/dev/tun0 /dev/tun10 /dev/tun12 /dev/tun14 /dev/tun2 /dev/tun4 /dev/tun6
/dev/tun8

/dev/tun1 /dev/tun11 /dev/tun13 /dev/tun15 /dev/tun3 /dev/tun5 /dev/tun7
/dev/tun9


509> ls /dev/tap*

/dev/tap0 /dev/tap10 /dev/tap12 /dev/tap14 /dev/tap2 /dev/tap4 /dev/tap6
/dev/tap8

/dev/tap1 /dev/tap11 /dev/tap13 /dev/tap15 /dev/tap3 /dev/tap5 /dev/tap7
/dev/tap9


And using ifconfig (with Hercules running):


utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000

inet6 fe80::d1b2:4144:8e63:d419%utun0 prefixlen 64 scopeid 0xc

nd6 options=201<PERFORMNUD,DAD>

utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380

inet6 fe80::8052:25e9:e02b:1178%utun1 prefixlen 64 scopeid 0xd

nd6 options=201<PERFORMNUD,DAD>

utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380

inet6 fe80::59fd:1d39:c29c:9aa6%utun2 prefixlen 64 scopeid 0xe

nd6 options=201<PERFORMNUD,DAD>

tun0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1500

inet 192.168.2.27 --> 192.168.2.210 netmask 0xffffff00

open (pid 12790)


Before starting Hercules I start IP forwarding:


sudo sysctl -w net.inet.ip.forwarding=1


And in hercules.cnf I have:


0E20.2 3088 CTCI --dev /dev/tun0 -s 255.255.255.255 -t 1500 192.168.2.210
192.168.2.27


Note that my router's IP address is 192.168.2.1.


Once I start Hercules:


sudo hercules -f hercules.cnf


and IPL z/OS, I wait for system initialization to complete and then I stop
tcpip and add the following to tcpip.profile.tcpip:


DEVICE CTCDEVICE CTC E20

LINK CTCLINK CTC 1 CTCDEVICE

HOME 192.168.2.210 CTCLINK


BEGINROUTES

ROUTE 192.168.2.1 255.255.255.0 = CTCLINK MTU DEFAULTSIZE

ROUTE DEFAULT 192.168.2.27 CTCLINK MTU DEFAULTSIZE

ENDROUTES


START CTCDEVICE


Note that I only need to make this change once.


Then I restart tcpip. Note that I also verify that CTCDEVICE starts.


After all that I try pinging zOS:


512> ping 192.168.2.210

PING 192.168.2.210 (192.168.2.210): 56 data bytes

Request timeout for icmp_seq 0

Request timeout for icmp_seq 1

Request timeout for icmp_seq 2

Request timeout for icmp_seq 3

Request timeout for icmp_seq 4

etc


Similarly telnet and ftp fail.


So what's going on? How can I get this to work reliably?


As always, thanks for your help.




-- 
John Murray