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From: Jethro on 28 Apr 2008 04:52
Hoping someone can shed some light on this weird problem.

I have a wireless router ( http://www.dynamode.net/upload/br6004wg1.pdf
). It is connected to my cable modem, and has been configured to
"spoof" the network card the modem was originally configured to. It
has been set to act as a DHCP server, and to assign IP addresses
192.168.1.2 - 192.168.1.100

Machine A is wired into it, and I have told the router to always
assign it's MAC an IP address of 192.168.1.100 This machine can access
the internet no problem. Both in windows and ubuntu, the network
interface has been set to "automactically obtain IP address".

Machine B is wireless connected. It is being assigned an IP address of
192.168.1.99 (which I find suspicous. What happened to 192.168.1.2 ?)
It too can happily access the internet.

So what can't machine A ping machine B, or machine B ping machine A ?

On both machines, after an unsuccessful ping, "ARP - A" shows the MAC
address of the other machine.

I tried running "Wireshark" under ubuntu to see what was happening,
but not being a network guru didn't really understand it.

The most annoying thing is that I've previously had 3 machines happily
connecting to each other, both wired and wireless. So something has
changed.

I'm convinced something is cached in my router (which is why it
insists on passing out .99 as the first assigned IP address). But I've
tried restoring the factory defaults, and it's still not working.

Can anyone suggest how to fix this please ?
From: James Egan on 28 Apr 2008 07:19

On Mon, 28 Apr 2008 01:52:34 -0700 (PDT), Jethro
<jethro_uk(a)hotmail.com> wrote:

>So why can't machine A ping machine B, or machine B ping machine A ?
>

Since both can connect to the Internet okay it's not a wireless issue.

Presumably the subnet mask is set to 255.255.255.0?

Ensure ICMP packets support is enabled in the router.

Ensure ICMP packets are not blocked by firewalls.

What do the routing tables say?



Jim.

From: Jack (MVP-Networking). on 28 Apr 2008 14:36
Hi
Does your Router supports static IP within the DHCP?
In most Routers if you want a computer to get the same IP with every log on
you have to assign a Static IP that is out of the DHCP range.
Jack (MVP-Networking).

"Jethro" <jethro_uk(a)hotmail.com> wrote in message
news:20315255-f869-4ba1-9c40-d2c095fdcb2d(a)8g2000hse.googlegroups.com...
> Hoping someone can shed some light on this weird problem.
>
> I have a wireless router ( http://www.dynamode.net/upload/br6004wg1.pdf
> ). It is connected to my cable modem, and has been configured to
> "spoof" the network card the modem was originally configured to. It
> has been set to act as a DHCP server, and to assign IP addresses
> 192.168.1.2 - 192.168.1.100
>
> Machine A is wired into it, and I have told the router to always
> assign it's MAC an IP address of 192.168.1.100 This machine can access
> the internet no problem. Both in windows and ubuntu, the network
> interface has been set to "automactically obtain IP address".
>
> Machine B is wireless connected. It is being assigned an IP address of
> 192.168.1.99 (which I find suspicous. What happened to 192.168.1.2 ?)
> It too can happily access the internet.
>
> So what can't machine A ping machine B, or machine B ping machine A ?
>
> On both machines, after an unsuccessful ping, "ARP - A" shows the MAC
> address of the other machine.
>
> I tried running "Wireshark" under ubuntu to see what was happening,
> but not being a network guru didn't really understand it.
>
> The most annoying thing is that I've previously had 3 machines happily
> connecting to each other, both wired and wireless. So something has
> changed.
>
> I'm convinced something is cached in my router (which is why it
> insists on passing out .99 as the first assigned IP address). But I've
> tried restoring the factory defaults, and it's still not working.
>
> Can anyone suggest how to fix this please ?

From: MaKiN_BaCoN on 28 Apr 2008 18:41
Go into add and remove windows components and see if your network service and
other network files and printer are both checked, because that was the
problem when I couldn't connect.

"Jack (MVP-Networking)." wrote:

> Hi
> Does your Router supports static IP within the DHCP?
> In most Routers if you want a computer to get the same IP with every log on
> you have to assign a Static IP that is out of the DHCP range.
> Jack (MVP-Networking).
>
> "Jethro" <jethro_uk(a)hotmail.com> wrote in message
> news:20315255-f869-4ba1-9c40-d2c095fdcb2d(a)8g2000hse.googlegroups.com...
> > Hoping someone can shed some light on this weird problem.
> >
> > I have a wireless router ( http://www.dynamode.net/upload/br6004wg1.pdf
> > ). It is connected to my cable modem, and has been configured to
> > "spoof" the network card the modem was originally configured to. It
> > has been set to act as a DHCP server, and to assign IP addresses
> > 192.168.1.2 - 192.168.1.100
> >
> > Machine A is wired into it, and I have told the router to always
> > assign it's MAC an IP address of 192.168.1.100 This machine can access
> > the internet no problem. Both in windows and ubuntu, the network
> > interface has been set to "automactically obtain IP address".
> >
> > Machine B is wireless connected. It is being assigned an IP address of
> > 192.168.1.99 (which I find suspicous. What happened to 192.168.1.2 ?)
> > It too can happily access the internet.
> >
> > So what can't machine A ping machine B, or machine B ping machine A ?
> >
> > On both machines, after an unsuccessful ping, "ARP - A" shows the MAC
> > address of the other machine.
> >
> > I tried running "Wireshark" under ubuntu to see what was happening,
> > but not being a network guru didn't really understand it.
> >
> > The most annoying thing is that I've previously had 3 machines happily
> > connecting to each other, both wired and wireless. So something has
> > changed.
> >
> > I'm convinced something is cached in my router (which is why it
> > insists on passing out .99 as the first assigned IP address). But I've
> > tried restoring the factory defaults, and it's still not working.
> >
> > Can anyone suggest how to fix this please ?
>
>
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