Hmmmm.... thanks for the replies...
Well... by playing around with this somemore I can perhaps now explaina
litttle more specifically what is happening.
I've got two computers I'm working with, one a linux box, acting as a
firewall internet gateway, and the other a Win95 machine for testing.
I make my PPP connection (via modem with pppd and chat) once established
I configure my firewall/gatewaying rules.
Everything appears to work, I can ping from both computers (the Win95 one
has the linux box as it's gateway) and I have web access from both, then
after a little while, perhaps of idleness, I try to ping something on the
Win95 machine... I get a "Reply from 192.168.1.1: destination host
unreachable"
This is very peculier because the IP for the two machines are 10.10.1.6
(for the linux box) and 10.10.1.7 for the Win95 machine. We do have
other computers on our network with 192.168.x.x IP addresses but I can't
see how they would be interfering with what I'm trying to do.
192.168.1.1 is a Novell Print and Fileserver.
So for whatever reason it now does not work. So I start putzing around
pinging things to see if anything works. From the client pings only
work to the internal network. From the gateway pings work to the external
network. Then I try pinging the client from the gateway. Nothing
happens, then I try pining another maching on the local network
(10.10.1.1) which happens to be our DHCP server (WinNT) This ping goes
through, then I try 10.10.1.7 (the client) again, and it goes through,
then I trying pinging the internet from the client, it now works again.
I just don't see the logic in why this is happening.
Also sometime I can't even ping 10.10.1.1 from the gateway when this
happens, it seems that it doens't allow any activity through the local
ethernet card.
Any ideas?
Thanks bunches,
Josh
On Wed, 2 Jun 1999, Audie Pierre wrote:
>
> * Isolate your DHCP server by using a static IP address on one of the clients.
> * If you suspect a client is not accessing the network:
> 1.) Check its IP configuration [winipcfg (95) or ipconfig (NT)]
> 2.) Ping your Linux gateway
> 3.) Check your Linux gateway's routing table (netstat -nr)
> 4.) Then ping the Internet from the gateway (Logically pinging the client(s) from
> the gateway should not bring the former back to life).
>
> * Another thing to consider is the PPP connection itself which might be timing out.
> However, it doesn't seem to be the case with yours because you are pinging right away
> at the Linux box ( I assume). I also assume that you are not using DIALD.
>
> * Are you running any dynamic routing daemon on the gateway (gated or routed)?
>
> I am not so sure where the problem is coming from but you could easily figure it out
> by eliminating some of the possibilities.
>
> Keep me informed on your progress.
>
>
> [EMAIL PROTECTED] wrote:
>
> > Hello,
> >
> > I'm running RedHat 5.2 with IP masquerading in attempt to provide
> > internet access to other computers in our office. As of now we do not
> > have our dedicated data line yet so the linux box is using a modem to
> > establish a ppp connection. It also has a NIC connecting it to the rest
> > of our internal network.
> >
> > The firewalling & masquerading rules have all been working for me but
> > then all of the sudden for no real reason nothing works anymore more.
> >
> > We are using internal ips of 10.x.x.x
> > Also on our network are Novell fileservers and an NT server which acts
> > normally as a DHCP server.
> >
> > The computer I am testing the linux gateway with is set with a static ip.
> >
> > The client computer seems to work fine with internet access for a while,
> > but then, perhaps after a few momements of inactivity, i'll try to do
> > something again and nothting will happen. So i attempt to ping an
> > externeal ip... that returns "network unreachable" or some other similar
> > message. I then check to make sure I can ping the gateway, that works
> > fine, I check to see if the gateway can ping the client, that works fine,
> > I ping a couple other things with the gateway to test connectivity and
> > all is well. Then I try pinging from the client again and things work
> > again? It seems that by pining the client from the gateway some
> > connection is re-established or something. I'm not quite sure what is
> > going on. If anyone has any insight on this I'd greatly appreciate it,
> > or if there is any more detailed information I can provide let me konw.
> > Thanks.
> >
> > Sincerely,
> > Josh Estelle
_______________________________________________
Masq maillist - [EMAIL PROTECTED]
http://tiffany.indyramp.com/mailman/listinfo/masq
Admin requests can be handled by web (above) or [EMAIL PROTECTED]
