IPs and masks
Richard Wilson
relw at mchsi.com
Tue Sep 5 18:41:31 MST 2006
All,
I am attaching a single sheet spreadsheet I put together some years ago
to help me keep my sanity dealing with multiple subnets at work...
I now keep it on Open Office, but often have to share the Excel version,
so I'm including both.
Rich W
------------------------
On Mon, 2006-09-04 at 19:57 -0700, Dazed_75 wrote:
> It looks now like the problem is an application problem (Canon's
> PhotoEX for my digital camera). The Save As lets me navigate to the
> desired location but will not save there. It may still be the
> firewall but if so, it should be popping a windw to ask if I will
> allow it and that is not happening. The Firewall log does not show
> anything on either machine. I found I AM able to copy files to and
> from the common storage using other methods using either Linux or
> Windows.
>
> This is a home network of machines. Some run Windows (mostly XP),
> some Linux, some dual boot XP and Linux (Ubuntu flavors mostly), a
> TiVo box, and sometimes visiting machines I work on for people. I am
> running an eTrust Personal Firewall on the Windows bootups but none on
> the Linux machines. They all sit behind a Linksys WRT54G. Not being
> a networking guru I do get confused sometimes about causes for things.
> Thanks for all your help and sorry I did not check this further before
> bothering folks.
>
> On 9/4/06, Randy Melder <randymelder at gmail.com> wrote:
> Actually, unless you are using a software firewall on one or
> both machines, or you physically have a firewall hardware
> between machines, your route won't even touch it. .101
> and .105 will talk directly to each other.
>
> To continue on this thought, your problem is not your
> addressing if all of your private addresses are locally
> connected or you have a NAT on your firewall routing
> 192.168.1.101 to an outside address.
>
> If you are using windows, try the following:
> 1. Open an MS DOS prompt.
> 2. Type: nbtstat -c
> 3. Type: net view
>
> If you see other computers on your network, then you're in
> good shape.
>
> Next...
> 4. Type ipconfig /all
>
> If your IP and subnet mask are correct, then....
>
> 5. Type ping 192.168.1.101
>
> If it replies, then your issue is with local settings.
>
> 6. Type: tracert 192.168.1.101 to see your route to .105.
>
> Hope this helps,
>
> ; ) .randy
>
>
>
>
>
> On 9/4/06, Dan Lund < situationalawareness at gmail.com> wrote:
> Your idea of subnet masking is right. 255.255.255.0
> (/24) is
> 192.168.1.0 - 255 (0 being network 255 being
> broadcast)
> So, everything being blocked would be specific to
> firewall rules.
> Maybe check your firewall rules?
> Maybe posting your ipchains or whatever other rules
> would spur info
> from someone else.
> --dan
>
> On 9/4/06, Dazed_75 <lthielster at gmail.com> wrote:
> > Exactly what does 192.168.1.0/255.255.255.0 mean? I
> always thought it meant
> > the 1st three octets (?) must match but that the
> fourth could be any value.
> > IOW, having my firewall show this network being in
> the trusted zone meant
> > any IP from 192.168.1.1 to 192.168.1.255 would be in
> the zone (I think the
> > other value means something special).
> >
> > Can someone correct me? Something isn't working as
> the 192.168.1.105 system
> > is apparently being blocked from writing to shared
> disk on 192.168.1.101 by
> > the firewall on 101 which shows the above being in
> the trusted zone.
> >
> > --
> > Be who you are and say what you feel, because those
> who mind don't matter
> > and those who matter don't mind. - Dr. Seuss
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>
>
> --
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> it."
> -Napoleon Bonaparte
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