On Feb 10, 2005, at 4:10 PM, Nix, Robert P. wrote:
The two zOS images can ping each other. Traceroute shows a direct
connection. Pinging to the linux image from a zOS LPAR times out, as
does pinging to the zVM TCPIP stack.
Now it gets fun. On the Linux image, ping works to zVM. Traceroute
shows a direct connection. Pinging the zOS LPARS times out. Traceroute
to one of the two zOS LPARS shows lines like "1 * * *", indicating a
timeout. Traceroute to the other zOS gives the following line:
1 tux23.mayo.edu (192.168.29.80)(H!) 0.000 ms (H!) 0.000ms (H!) 0.000
ms
This seems like a netmask issue.
My guess is that your packets don't know how to get back to Linux from
z/OS.
Are you sure that the z/OS side has a 24-bit netmask? My guess is that
the z/OS guys don't know that they're directly connected to
192.168.29.0/24, and that they're using 0/26 or something. Worse, they
may not be configured the same, since you're getting host unreachable
from one and a timeout from the other.
It's not a routing issue, per se, since the hosts are all on the same
subnet. Which is why I guess that not everyone has a consistent view
of the subnet.
Adam
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