|
HP OpenVMS Systemsask the wizard |
|
The Question is: I can connection with Alpha from PC (Windows) with telnet from various IP-adress. When I try connect to Alpha with FTP It possible from my subnet IP-address and inpossible from another subnet. ( for example: my Ip-adress is 10.3.2.1 and another IP-addres s is 10.111.1.1 and Alpha Ip-address is 10.3.2.250 ?) What can I do? The Answer is :
It appears that your local IP infrastructure and your local IP router(s)
are incorrectly configured, or that there is a firewall or router or
other similar construct effectively blocking access.
Use of ping and traceroute and other tools would be in order, of course.
10.* addresses are internal (private) addresses of course, and may or
may not pass through your internal network routers and gateways, and
there is a router or gateway between your subnets.
Per RFC 1918:
"The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)"
...
"Because private addresses have no global meaning, routing information
about private networks shall not be propagated on inter-enterprise
links, and packets with private source or destination addresses
should not be forwarded across such links. Routers in networks not
using private address space, especially those of Internet service
providers, are expected to be configured to reject (filter out)
routing information about private networks. If such a router receives
such information the rejection shall not be treated as a routing
protocol error."
For addition details on the internal class A 10.*.*.* network address
range, please see RFC 1918.
Your OpenVMS version and the likely TCP/IP Services versions are both
old and an upgrade to more current (and supported) versions is strongly
recommended.
|