pingable, but can't ping

pingable, but can't ping

Post by brucemohle » Tue, 13 Jun 2000 04:00:00




> I have a machine with 2 3Com 3C509B NICs in it.  I'm only trying to get
> the first NIC working.  The machine was just installed with RH 6.2
> (stock server install) with no other mods or patches (yet).

> Both NICs have been configured with the 3C5X9CFG program to have PNP
> turned off and their irq and io addresses set (irq = 10, io = 300 for
> the first card, irq = 11, io = 310 for the second).

> The NIC I'm trying to get working is on eth0.  The other NIC is not
> configured and there's no ifcfg-eth1 configuration file in
> /etc/sysconfig/network-scripts for it.

> An lsmod says that the 3c509 driver is loaded and in use.  Looking at
> /proc/ioports, I see the driver associated with the I/O address range
> (300-30f).  Looking at /proc/interrupts, IRQ 10 is associated with
> eth0.  According to ifconfig, eth0 is UP and running.

> I can ping this machine from another machine on the same hub, but I
> can't ping out anywhere from this machine.  I've tried pinging the other
> machine, the default router, and the first of 2 name servers from this
> machine.  No response.

> I'm stumped.  Any ideas on what I should try next?

Okay, I'm able to ping the other computer on my local network.

It turned out that Red Hat modified the behavior of ping in the RH 6.2
release.
From their "Red Hat Linux 6.2 Gotchas and Workarounds" web page:

"The functionality of the 'ping' command has changed. This is resulting in
many perceived problems with network configuration. The issue at hand is
that the simple 'ping' command does a lookup of symbolic names for the
host address even if pinging by IP. If you do not have DNS set up and
working you will get a lack of response that in times past would not have
been present."

So, using the -n option, I was able to ping the other machine.

Now, when I ping the default router (specifying the interface), I get

Destination Host Unreachable

Suggestions?  [I hope.]

> Thanks, in advance.

> Bruce

> --
> Bruce W. Mohler                858-826-2675 (voice)
> SAIC/ITS/Server Support        858-826-7806 (fax)
> Sr UNIX system administrator   888-781-5697 (pager)

> Of course my password is the same as my pet's name.
> My dog's name is bur4$rut, but I change it every 90 days.

--
Bruce W. Mohler                858-826-2675 (voice)
SAIC/ITS/Server Support        858-826-7806 (fax)
Sr UNIX system administrator   888-781-5697 (pager)

Of course my password is the same as my pet's name.
My dog's name is bur4$rut, but I change it every 90 days.
 
 
 

1. pingable but not able to ping

I have searched the archives and have found many similar problems but
none of the proposed solutions have worked for me...

Anyone can ping my address from the network, but when I attempt to ping
any address (on the local subnet or otherwise) I lose about 90% of the
packets.

The strangest part is that I lose packets even when pinging the local
address.  Pinging the loopback address works fine so I suspected a NIC
problem but swapping it out resulted in the same problem.

If I remove the default route (0.0.0.0) and then remove the 10.6.5.0
route, I can then ping the local address without a problem.

Kernel IP routing table
Destination     Gateway     Genmask         Flags Metric Ref    Use
Iface
10.6.5.22       0.0.0.0     255.255.255.255 UH    0      0        0 eth0
10.6.5.0        0.0.0.0     255.255.255.0   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         10.6.5.1    0.0.0.0         UG    0      0        0 eth0

eth0      Link encap:Ethernet  HWaddr 00:08:C7:DF:45:95
          inet addr:10.6.5.22  Bcast:10.6.5.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:167179757 errors:2 dropped:0 overruns:0 frame:1
          TX packets:000065329 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:22 Memory:0x6000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16192  Metric:1
          RX packets:144 errors:0 dropped:0 overruns:0 frame:0
          TX packets:144 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0

I'm using RedHat 6.2 kernal 2.2.14
Any help is appreciated.

-Kirk

Sent via Deja.com http://www.deja.com/
Before you buy.

2. PC IMAC ISDN card with RH 5 ?

3. Canned "ping"

4. FAQ: comp.lang.awk: pointer

5. It's not bad canned meat...

6. installing SunSoft ProCompiler error

7. blocked doubleclick ad = long browser timeout

8. D-link DE220 can PING his own IP, but can't PING others'

9. Why isn't Linux box "pingable" by name?

10. NETGEAR FA410 Can PING out can't be PING'd

11. ping -g 'gateway-IP' 'host-IP' DOESN'T work!

12. 'ping' sees route but 'telnet' doesn't??