[ale] RH8 "Temporary failure in name resolution"

[kjkrum at comcast.net (Kevin Krumwiede)]

On Mon, 2003-02-17 at 22:37, Jonathan Glass (IBB) wrote:
> Quite frankly, your subnet mask looks wrong.  You may want to verify it.
> 
> Can you run "cat /proc/sys/net/ipv4/ip_forward"?  If it is 0, then you
> are not routing on your router box.

Routing works.  DHCP works, both client and server.  Inbound connections
to sshd and httpd work.  The only thing that doesn't work is any kind of
outbound connection.  From an SSH session into the router, I can't ping,
I can't telnet, I can't do hostname lookups.

It *can't* be the routing table, because the machine correctly routes
packets between the internal and external networks.  NAT is working
perfectly.

In short, the router is behaving as if I had done the following:

   # iptables -F OUTPUT
   # iptables -P OUTPUT DROP

But the packets aren't even getting as far as the OUTPUT chain.  There's
nothing there to log.  There's nothing at all in tcpdump.

 
> This really sounds like a mask issue.  T U sure it is not supposed 2 B
> 255.255.255.254?  Do you have more than 2 usable ip addies?

255.255.254.0 is the DHCP-assigned netmask for my external subnet
(68.54.20.0/23).

255.255.255.0 is my internal network (192.168.1.0/24).


> > # netstat -r
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags   MSS Window  irtt
> > Iface
> > 192.168.1.0     *               255.255.255.0   U        40 0          0
> > eth1
> > 68.54.20.0      *               255.255.254.0   U        40 0          0
> > eth0
> > 127.0.0.0       *               255.0.0.0       U        40 0          0
> > lo
> > default         68.54.20.1      0.0.0.0         UG       40 0          0
> > eth0
> > 
> > #ifconfig eth0
> > eth0      Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX  
> >           inet addr:68.54.21.XX  Bcast:68.54.21.255  Mask:255.255.254.0
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:1825751 errors:1 dropped:0 overruns:0 frame:1
> >           TX packets:1034919 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:1537 txqueuelen:100 
> >           RX bytes:384340324 (366.5 Mb)  TX bytes:149228183 (142.3 Mb)
> >           Interrupt:11 Base address:0x1000 


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