Re: Hercules networking redux

Hi John,

The utun interfaces are normally managed by macos in the VPN process....

Also, check pf.conf to be sure you are forwarding packets between devices
correctly.

Joe

On Thu, Jun 13, 2019 at 6:26 PM John Murray [email protected]
[hercules-390] <[email protected]> wrote:

>
>
> 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
>
> 
>