Strange networking issue on red hat 7.2 can anyone help?

Strange networking issue on red hat 7.2 can anyone help?

Post by chadp.. » Fri, 14 Dec 2001 04:47:56



This is strange and I am lost for words on it. I have worked a great
deal putting Red Hat  Linux 7.0 and earlier on computers connected to
internal private networks and onto cable modems.  

I am now working on building and networking a Red Hat 7.2 computer for
the company's new mail  and web server. I have 6  Ip addresses
subnetted for the company. ANd on the inside network they run a class
A private  addressing.

The external Real world IPs that I have are:

12.21.124.56 to 12.21.124.63   this is a /29  subnet  which is
255.255.255.252

also have two more out side IPs 12.21.124.32 /30  to 12.21.124.35 /30

Inside uses a 10.10.10.1 to 10.10.10.254  

The Linux box would be on the outside, currently on the 12.21.124.60
IP address.   Its gateway is 12.21.124.57 - our ISDN router
the subnet is  255.255.255.252
dns on 12.21.120.2

I had two card in it, then took one out.  Using 3com 3c905b cards.
With just the one netcard, I tried it on the 12.21.124.60 /29 network.
I could ping local host and ping the IP 12.21.124.60 but could not
ping the router or anything else. I installed rh 7.2 with "no
firewall" and I can not get it to see the Internet.

I even tried to put it inside our network on 10.10.10.17 and all
proper configurations for the internal network as I do with all the
windows machines.  It did not like the 10.10.10.17 ip and also does
not like the  /29  subnet with my 6 usable Ip addresses.

Any clues or suggestions?

I bet if I took it home to my cable modem and set it up, it would
work.

Never seen anything like this.  

Chad Pauli


 
 
 

Strange networking issue on red hat 7.2 can anyone help?

Post by Karl Heye » Fri, 14 Dec 2001 07:10:32



> The Linux box would be on the outside, currently on the 12.21.124.60
> IP address.   Its gateway is 12.21.124.57 - our ISDN router
> the subnet is  255.255.255.252
> dns on 12.21.120.2

> I had two card in it, then took one out.  Using 3com 3c905b cards.
> With just the one netcard, I tried it on the 12.21.124.60 /29 network.
> I could ping local host and ping the IP 12.21.124.60 but could not
> ping the router or anything else. I installed rh 7.2 with "no
> firewall" and I can not get it to see the Internet.

> I even tried to put it inside our network on 10.10.10.17 and all
> proper configurations for the internal network as I do with all the
> windows machines.  It did not like the 10.10.10.17 ip and also does
> not like the  /29  subnet with my 6 usable Ip addresses.

ifconfig and route -n first

then try running tcpdump -n -i eth0
whilst that is running try pinging the ISDN router.

I cannot see initially why it would fail.  I would double check the
netmasks first, /29 is .248 not 252 (which is /30)

karl.

 
 
 

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