Redhat 7.2 getting confused with my internal network.

Redhat 7.2 getting confused with my internal network.

Post by Ben Rometsc » Mon, 10 Dec 2001 22:00:14



Hi,

I have a RedHat 7.2 box acting as firewall/NAT and a Windows XP machine
connected thru a hub to a second internally addressed NIC in the RedHat box.
Every now and then (maybe once every couple of days) the XP machine loses
connectivity with the internal RedHat box. The XP machine is on 192.168.0.2
and the RH machine on 192.168.0.1. Trying to ping 192.168.0.1 from the XP
machine times out.

The only way I can get connectivity back to the XP machine is by rebooting
the Redhat box. Very frustrating. Does anyone have any idea why this is
happening? The redhat machine is not falling over - it is still receiving
messages like this in /var/log/messages:

Dec  8 11:07:58 redhat kernel: Firewall:IN=eth0 OUT=
MAC=ff:ff:ff:ff:ff:ff:00:30:80:f0:60:54:08:00 SRC=10.180.128.1
DST=255.255.255.255 LEN=335 TOS=0x00 PREC=0x00 TTL=255 ID=48598 PROTO=UDP
SPT=67 DPT=68 LEN=315
Dec  8 11:08:17 redhat kernel: Firewall:IN=eth0 OUT=
MAC=00:00:21:c8:4a:30:00:30:80:f0:60:54:08:00 SRC=63.149.6.93
DST=62.30.157.*** LEN=54 TOS=0x00 PREC=0x00 TTL=111 ID=20691 PROTO=UDP
SPT=1227 DPT=32770 LEN=34

(From DNS2GO heartbeats I believe). So the Redhat machine maintains
connectivity with the outside world, it just seems to lose the internal
network. I have a Netgear fast ethernet card in each machine, linked to a
10/100 Netgear fast ethernet hub.

Does anyone have any idea why this might be happening?

Thanks very much,
Ben

 
 
 

Redhat 7.2 getting confused with my internal network.

Post by David Mean » Mon, 17 Dec 2001 10:13:21


Do the netmasks agree between the Linux box and the XP machine?
If they are different, when the XP machine discards an ARP entry due
to extreme age, it might not be able to hear the ARP reply that the Linux
box sends.  This could cause the symptom that you report.


Quote:> Hi,

> I have a RedHat 7.2 box acting as firewall/NAT and a Windows XP machine
> connected thru a hub to a second internally addressed NIC in the RedHat
box.
> Every now and then (maybe once every couple of days) the XP machine loses
> connectivity with the internal RedHat box. The XP machine is on
192.168.0.2
> and the RH machine on 192.168.0.1. Trying to ping 192.168.0.1 from the XP
> machine times out.

> The only way I can get connectivity back to the XP machine is by rebooting
> the Redhat box. Very frustrating. Does anyone have any idea why this is
> happening? The redhat machine is not falling over - it is still receiving
> messages like this in /var/log/messages:

> Dec  8 11:07:58 redhat kernel: Firewall:IN=eth0 OUT=
> MAC=ff:ff:ff:ff:ff:ff:00:30:80:f0:60:54:08:00 SRC=10.180.128.1
> DST=255.255.255.255 LEN=335 TOS=0x00 PREC=0x00 TTL=255 ID=48598 PROTO=UDP
> SPT=67 DPT=68 LEN=315
> Dec  8 11:08:17 redhat kernel: Firewall:IN=eth0 OUT=
> MAC=00:00:21:c8:4a:30:00:30:80:f0:60:54:08:00 SRC=63.149.6.93
> DST=62.30.157.*** LEN=54 TOS=0x00 PREC=0x00 TTL=111 ID=20691 PROTO=UDP
> SPT=1227 DPT=32770 LEN=34

> (From DNS2GO heartbeats I believe). So the Redhat machine maintains
> connectivity with the outside world, it just seems to lose the internal
> network. I have a Netgear fast ethernet card in each machine, linked to a
> 10/100 Netgear fast ethernet hub.

> Does anyone have any idea why this might be happening?

> Thanks very much,
> Ben


 
 
 

1. I'm confused with ipchains/iptables on Redhat 7.2

I have the server RH installed kernel version 2.4.7-10.
It appears to be using ipchains because when I do a lsmod ipchains appears in
the list.  But I thought iptables was the default for RH 7.2.

I'm using pmfirewall to configure the it and it allows the web and chat traffic
thru so I'm happy with it.
BUT now I want to do some port forwarding and am not having any success.
I need to forward port 2047 and 8888 one of my internal machines but I'm lost.

So if someone could tell me which direction  to go with this I'll follow up with
more specifics.

Thanks,
darwin

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