Unable to Ping a Particular IP

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Guest

I have a real strange situation. All of my computers are connected to the
same Network, and all with the same subnet. On every computer, but one, I
can ping ALL IP addresses. On the one computer I am having a challenge with,
it can ping ALL but 2 IP addresses in the network. When I ping the 2 I
receive Requested Time Out. Any ideas why?? Our computers are running W2K
SP4.

Thanks in advance for your assistance
 
Kevin said:
I have a real strange situation. All of my computers are connected to the
same Network, and all with the same subnet. On every computer, but one, I
can ping ALL IP addresses. On the one computer I am having a challenge with,
it can ping ALL but 2 IP addresses in the network. When I ping the 2 I
receive Requested Time Out. Any ideas why??
Click to expand...

Not without knowing exactly what the machine's network settings
are,...including those IP#s.
 
Sorry Phillip, I forgot to mention that.
Our IP range is 128.0.0.1 - 254, with a subnet of 255.255.255.0. The 2 IPs
in question is 128.0.0.7 & 128.0.0.10. As I mentioned before, I can ping
these IP addresses from every computer but on, whose IP is 128.0.0.85. From
this IP (128.0.0.85) I can ping itself and ALL other IP addresses that are
active. From mine (128.0.0.190) I can ping Everything including 128.0.0.7 /
10 / & 85.

Very Odd I think anyway.
 
One Nic? All these addresses on the same Nic? Just do and "IPConfig /All"
and post the results.

BTW - these are Public addresses that show only registered to IANA in Marina
del Rey, California. I see no registration of a /24 bit subset of those
numbers. You cannot use Publicly registered numbers that you do not own and
not expect to have problems. This would not likely be your current problem,
but eventually you will probably have issues.
 
All of our computers are utilizing only one NIC, and with the exception of 4
computers, which have static IPs, they all use DHCP. Here is the IPconfig
/all info for my computer:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast
Et
ernet NIC
Physical Address. . . . . . . . . : 00-10-DC-98-C0-8A
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 128.0.0.190
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 128.0.0.2
DHCP Server . . . . . . . . . . . : 128.0.0.1
DNS Servers . . . . . . . . . . . : 63.101.60.4
63.101.60.5
Primary WINS Server . . . . . . . : 128.0.0.1
Lease Obtained. . . . . . . . . . : Tuesday, March 08, 2005 3:39:43 AM
Lease Expires . . . . . . . . . . : Friday, March 11, 2005 3:39:43 AM


Thanks for the info about the IP range, will pass it on to my bosses.

Phillip Windell said:
One Nic? All these addresses on the same Nic? Just do and "IPConfig /All"
and post the results.

BTW - these are Public addresses that show only registered to IANA in Marina
del Rey, California. I see no registration of a /24 bit subset of those
numbers. You cannot use Publicly registered numbers that you do not own and
not expect to have problems. This would not likely be your current problem,
but eventually you will probably have issues.


--

Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com


Kevin said:
Sorry Phillip, I forgot to mention that.
Our IP range is 128.0.0.1 - 254, with a subnet of 255.255.255.0. The 2 IPs
in question is 128.0.0.7 & 128.0.0.10. As I mentioned before, I can ping
these IP addresses from every computer but on, whose IP is 128.0.0.85. From
this IP (128.0.0.85) I can ping itself and ALL other IP addresses that are
active. From mine (128.0.0.190) I can ping Everything including 128.0.0.7 /
10 / & 85.

Very Odd I think anyway.
Click to expand...
Click to expand...
 
in message
: All of our computers are utilizing only one NIC, and with the exception of
4
: computers, which have static IPs, they all use DHCP. Here is the IPconfig
: /all info for my computer:
: Connection-specific DNS Suffix . :
: Description . . . . . . . . . . . : Realtek RTL8139/810x Family
Fast
: Et
: ernet NIC
: Physical Address. . . . . . . . . : 00-10-DC-98-C0-8A
: Dhcp Enabled. . . . . . . . . . . : Yes
: Autoconfiguration Enabled . . . . : Yes
: IP Address. . . . . . . . . . . . : 128.0.0.190
: Subnet Mask . . . . . . . . . . . : 255.255.255.0
: Default Gateway . . . . . . . . . : 128.0.0.2
: DHCP Server . . . . . . . . . . . : 128.0.0.1
: DNS Servers . . . . . . . . . . . : 63.101.60.4
: 63.101.60.5
: Primary WINS Server . . . . . . . : 128.0.0.1
: Lease Obtained. . . . . . . . . . : Tuesday, March 08, 2005 3:39:43
AM
: Lease Expires . . . . . . . . . . : Friday, March 11, 2005 3:39:43
AM
:
:
: Thanks for the info about the IP range, will pass it on to my bosses.

Hi Kevin...

I see several issues and your IP is the least of them.

1. As Phillip mentioned, you're using someone else's IP. I'm not even sure
how you're getting to the net with those as your ISP should not be
forwarding them.
2. If you're running AD (Active Directory) your master DC should be running
DNS and you should point it all other systems to it for DNS.
3. If you have a NAT/firewall or Proxy server, then I can why you can get
out to the Internet but you'll never get to the 128.x.x.x subnet because
your is using it locally.
4. Set a forwarder in your DNS Server settings to your router. Your router
can be set to use your ISPs DNS.

If you want to use a Class B subnet, although you're masking off 24 bits,
you should use 172.16.x.x.
But, since you're only using a Class C mask, you should consider using
192.168.x.x.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;142863

It's hard to say why you're not able to ping from some workstations but try
tracert to see where the IP goes. I would look at cleaning up my IP first
so you know nothing else is an issue.
What interconnectivity devices are present on the network?
Other than ICMP messages, are there issues with the systems that do not get
a reply?
Is there a personal firewall involved? Antivirus blocking PING like NAV?

--
Roland Hall
/* This information is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of merchantability
or fitness for a particular purpose. */
Online Support for IT Professionals -
http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech
How-to: Windows 2000 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201
FAQ W2K/2K3 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;291382
 
I am not sure how we came about using the 128.x.x.x range, as it was in place
when I started here last July, and they are used for internal use only.
Everything I am pinging is within our Router. I did try to do a tracert on
one of the problem IPs & received the Requested Time Out repsonse. Doing a
tracert to all other internal IPs goes directly to that IP. As an example:

H:\>tracert 128.0.0.8

Tracing route to 128.0.0.8 over a maximum of 30 hops

1 19 ms 18 ms 20 ms 128.0.0.8

Trace complete.

H:\>tracert 128.0.0.10

Tracing route to 128.0.0.10 over a maximum of 30 hops

1 * * * Request timed out.
2 * * * Request timed out.
3 * * * Request timed out.
 
in message

Top posting makes it more difficult on this end.

:I am not sure how we came about using the 128.x.x.x range, as it was in
place
: when I started here last July, and they are used for internal use only.

They can only be used for internal use and you cannot get to the public
address where these have been allocated from that LAN. I understand and
sympathize dealing with an inherited network. I see a lot of other networks
that some just absolutely make me cringe.

: Everything I am pinging is within our Router.

Not sure what "within our router" means other than on the local subnet. I'm
more interested in switches, VLANs, spanning tree, portfast, etc.

Surely not everyone plugs into the same switch. Are they stacked?
Collapsed backbone? Are the systems, that have the issues, on the same
switch?

Also, you didn't answer all my questions. I now have more.

Other than PING not getting a reply, are there other issues with the
workstations that have the PING issue?
Is Active Directory present?
Is yes, is that the Primary and only DNS for everyone on the LAN? If not,
why?
What address are you at when you're running tracert that you showed below?
Can you provide the IPCONFIG /all for that system and one that works? Can
you also show the routing table? (ROUTE PRINT)
Is Antivirus present? If so, which one?
Personal Firewall present? If so, which one?
Host-based IDS (i.e. BlackICE PC Protection) - If so, which one?


: I did try to do a tracert on
: one of the problem IPs & received the Requested Time Out repsonse. Doing
a
: tracert to all other internal IPs goes directly to that IP. As an
example:
:
: H:\>tracert 128.0.0.8
:
: Tracing route to 128.0.0.8 over a maximum of 30 hops
:
: 1 19 ms 18 ms 20 ms 128.0.0.8
:
: Trace complete.
:
: H:\>tracert 128.0.0.10
:
: Tracing route to 128.0.0.10 over a maximum of 30 hops
:
: 1 * * * Request timed out.
: 2 * * * Request timed out.
: 3 * * * Request timed out.

--
Roland Hall
/* This information is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of merchantability
or fitness for a particular purpose. */
Online Support for IT Professionals -
http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech
How-to: Windows 2000 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201
FAQ W2K/2K3 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;291382
 
We are not running Active Directory, and the Anti-virus we are using is Trend
Micro. Following is the tracert for the good, from 128.0.0.51, and from the
one where it doesn't work (128.0.0.85)

H:\>tracert 128.0.0.10

Tracing route to 128.0.0.10 over a maximum of 30 hops

1 * * * Request timed out.
2 * * * Request timed out.
3 ^C

Tracing route to 128.0.0.10 over a maximum of 30 hops

1 16 ms 31 ms 16 ms 128.0.0.10

Trace complete.

and the route tables

C:\Documents and Settings\Administrator>route print
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x1000003 ...00 01 80 2f 7f 43 ...... Intel(R) PRO Adapter
0x1000004 ...00 04 5a 77 5f ce ...... Linksys LNE100TX(v5) Fast Ethernet
Adapter
NDIS5 Driver
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 128.0.0.1 128.0.0.51 1
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
128.0.0.0 255.255.255.0 128.0.0.51 128.0.0.51 1
128.0.0.0 255.255.255.0 128.0.0.89 128.0.0.89 1
128.0.0.51 255.255.255.255 127.0.0.1 127.0.0.1 1
128.0.0.89 255.255.255.255 127.0.0.1 127.0.0.1 1
128.0.255.255 255.255.255.255 128.0.0.51 128.0.0.51 1
128.0.255.255 255.255.255.255 128.0.0.89 128.0.0.89 1
224.0.0.0 224.0.0.0 128.0.0.51 128.0.0.51 1
224.0.0.0 224.0.0.0 128.0.0.89 128.0.0.89 1
255.255.255.255 255.255.255.255 128.0.0.51 128.0.0.51 1
Default Gateway: 128.0.0.1
===========================================================================
Persistent Routes:
None

C:\>route print
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x1000003 ...00 a0 cc da d1 86 ...... NETGEAR FA310TX Fast Ethernet PCI
Adapter
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 128.0.0.1 128.0.0.85 1
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
128.0.0.0 255.255.255.0 128.0.0.85 128.0.0.85 1
128.0.0.85 255.255.255.255 127.0.0.1 127.0.0.1 1
128.0.255.255 255.255.255.255 128.0.0.85 128.0.0.85 1
224.0.0.0 224.0.0.0 128.0.0.85 128.0.0.85 1
255.255.255.255 255.255.255.255 128.0.0.85 128.0.0.85 1
Default Gateway: 128.0.0.1
===========================================================================
Persistent Routes:
None
 
in message
: We are not running Active Directory, and the Anti-virus we are using is
Trend
: Micro. Following is the tracert for the good, from 128.0.0.51, and from
the
: one where it doesn't work (128.0.0.85)
:
: C:\Documents and Settings\Administrator>route print
:
===========================================================================
: Interface List
: 0x1 ........................... MS TCP Loopback interface
: 0x1000003 ...00 01 80 2f 7f 43 ...... Intel(R) PRO Adapter
: 0x1000004 ...00 04 5a 77 5f ce ...... Linksys LNE100TX(v5) Fast Ethernet
: Adapter
: NDIS5 Driver

Two interfaces on the same network? Are you load balancing? Does
128.0.0.85 have a direct physicial connection to 128.0.0.10 meaning no other
devices other than interconnectivity in between?

Tell me what is physically between 128.0.0.85 and 128.0.0.10.

Ex.
128.0.0.85 - switch - 128.0.0.10
128.0.0.85 - switch - server - different switch - 128.0.0.10

Still need this info:

Not sure what "within our router" means other than on the local subnet. I'm
more interested in switches, VLANs, spanning tree, portfast, etc.

Surely not everyone plugs into the same switch. Are they stacked?
Collapsed backbone? Are the systems, that have the issues, on the same
switch?

Other than PING not getting a reply, are there other issues with the
workstations that have the PING issue?

Can you provide the IPCONFIG /all for that system [128.0.0.85] and one that
works [128.0.0.51]?

Personal Firewall present? If so, which one?
Host-based IDS (i.e. BlackICE PC Protection) - If so, which one?

Also, is the router have any ACLs?

--
Roland Hall
/* This information is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of merchantability
or fitness for a particular purpose. */
Online Support for IT Professionals -
http://support.microsoft.com/servicedesks/technet/default.asp?fr=0&sd=tech
How-to: Windows 2000 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;308201
FAQ W2K/2K3 DNS:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;291382
 
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