[NTLUG:Discuss] can't ping to 2 NIC box

[MadHat]

m m wrote:
> 
> >From: MadHat <madhat at unspecific.com>
> 
> >m m wrote:
> > >
> > > Hi all:
> > > I have a linux box (say, SA) with 2 NICs, use RH 6.2 os.
> > > etho w/ public IP (64.100.100.100) connect to the network switch.
> > > eth1 w/ non-routeable IP (192.168.0.1) connect to ahother pc (say, SB)
> >w/ IP
> > > (192.168.0.2).
> > > I have is it physical connected, problems are:
> > > ping from SA to SB, the error message is: destination Host Unreachable
> > > ping from SB to SA, it hang on there.
> > >
> > > /etc/hosts on SA has all the hosts information.
> > >
> > > any suggestions?
> >
> >routes? (run 'netstat -rn' and let us see).
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> 192.168.100.1   0.0.0.0         255.255.255.255 UH        0 0          0
> eth1
> 64.100.100.100  0.0.0.0         255.255.255.255 UH        0 0          0
> eth0
> 64.0.0.0        64.100.100.100  255.255.255.248 UG        0 0          0
> eth0
> 192.168.100.0   192.168.100.1   255.255.255.0   UG        0 0          0
> eth1
> 192.168.100.0   0.0.0.0         255.255.255.0   U         0 0          0
> eth1
> 64.0.0.0        0.0.0.0         255.0.0.0       U         0 0          0
> eth0
> 127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
> 0.0.0.0         64.100.100.100  0.0.0.0         UG        0 0          0
> eth0

Something looks wrong here.  Like the external IP is 64.100.100.100, but
the default route is the same (not that this would cause the  problem
you describe, but.... )

What was the exact error you receive when you try a pig, Or was there an
error?  Also, do you have IPchains working?  Have you reset...  damn,
/proc/ somethign...  hold on
I want to say /proc/sys/net/ipv4/ip_forward, but I am not on the right
machine right now....  anyway, this is supposed to be reset to one when
ipchains is started for it to work.  
echo 1 > /proc/sys/net/ipv4/ip_forward

someone want to verify this for me, or I can do it monday.


> 
> >is IP forwarding turned on (enabled in the kernel)?
> yes
> 
> >Are you using this like a firewall/router?
> yes
> 
> >What distro, or have you rebuilt the kernel?
> redhat 6.2 original kernel.

-- 
MadHat at unspecific.com
                                   "The 3 great virtues of a programmer:
                                      Laziness, Impatience, and Hubris."
                                                 --Larry Wall