[RHEL] [linux] RHEL/CentOS 4 networking trouble

Fri Jul 6 12:09:36 PDT 2007

Hi all,

Thanks for everyone's help so far. Iptables is running, all ICMP  
traffic is permitted, and all traffic is permitted on eth1.

Based on previous experience, this interface will work normally after  
a reboot (which I will probably do tonight, but the server is in  
production).

I cannot ping from 10.254.250.225, and tcpdump listening on  
10.254.250.226 (eth1) does not see any incoming echo requests.  
10.254.250.226 can ping itself, but the traffic does not show up on a  
tcpdump -i eth1.

There are no errors in dmesg, just the interface entering and leaving  
promiscuous mode.

# lspci
00:00.0 Host bridge: Intel Corporation E7230/3000/3010 Memory  
Controller Hub (rev c0)
00:01.0 PCI bridge: Intel Corporation E7230/3000/3010 PCI Express Root  
Port (rev c0)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express  
Port 1 (rev 01)
00:1c.4 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI  
Express Port 5 (rev 01)
00:1c.5 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI  
Express Port 6 (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB  
UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB  
UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB  
UHCI Controller #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB  
UHCI Controller #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2  
EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC  
Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE  
Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller  
(rev 01)
01:00.0 RAID bus controller: 3ware Inc 9650SE SATA-II RAID (rev 01)
09:00.0 PCI bridge: Intel Corporation 6702PXH PCI Express-to-PCI  
Bridge A (rev 09)
09:00.1 PIC: Intel Corporation 6700/6702PXH I/OxAPIC Interrupt  
Controller A (rev 09)
0d:00.0 Ethernet controller: Intel Corporation 82573E Gigabit Ethernet  
Controller (Copper) (rev 03)
0e:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet  
Controller
0f:00.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)

# cat /proc/interrupts
            CPU0       CPU1
   0: 1847722719 1847850788    IO-APIC-edge  timer
   8:       6176       6146    IO-APIC-edge  rtc
   9:          0          0   IO-APIC-level  acpi
  14:   16611890   16620499    IO-APIC-edge  ide0
169:     822830     850938   IO-APIC-level  3w-9xxx, uhci_hcd
185:          0          0   IO-APIC-level  ehci_hcd, uhci_hcd
193:          0          0   IO-APIC-level  uhci_hcd
201:          0          0   IO-APIC-level  uhci_hcd
217:   19656864          0         PCI-MSI  eth0
225:          6      36031         PCI-MSI  eth1
NMI:          0          0
LOC: 3620733626 3620733627
ERR:          0
MIS:          0

Jonathan

Quoting Meryll Larkin <meryll at u.washington.edu>:

> Hi Jonathan,
>
> If this server can be out of a production loop for a period of time:  have
> you considered trying to use NIC that is now eth0 to server the eth1
> connection?  and the opposite?  That would help isolate if the problem was
> hardware (the NIC) or software/settings.
>
> Meryll
>
>
> ----- Original Message -----
> From: "Jonathan Nicol" <jnicol at backnine.org>
> To: <linux at u.washington.edu>
> Sent: Friday, July 06, 2007 10:24 AM
> Subject: Re: [RHEL] [linux] RHEL/CentOS 4 networking trouble
>
>
> I'm trying to ping 10.254.250.225.
>
> ]# ping -I eth1 10.254.250.225
> PING 10.254.250.225 (10.254.250.225) from 10.254.250.226 eth1: 56(84)
> bytes of data.
>  From 10.254.250.226 icmp_seq=1 Destination Host Unreachable
>  From 10.254.250.226 icmp_seq=2 Destination Host Unreachable
>  From 10.254.250.226 icmp_seq=3 Destination Host Unreachable
>
> --- 10.254.250.225 ping statistics ---
> 7 packets transmitted, 0 received, +3 errors, 100% packet loss, time 5999ms
> , pipe 4
>
> # ifconfig eth1
> eth1      Link encap:Ethernet  HWaddr 00:30:48:8E:B4:5D
>            inet addr:10.254.250.226  Bcast:10.254.250.255
> Mask:255.255.255.224
>            inet6 addr: fe80::230:48ff:fe8e:b45d/64 Scope:Link
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:55 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:100
>            RX bytes:4069 (3.9 KiB)  TX bytes:0 (0.0 b)
>            Base address:0x6000 Memory:e0400000-e0420000
>
>
> Jonathan
>
>
> Quoting Gordon Messmer <gmessmer at u.washington.edu>:
>
>> Jonathan Nicol wrote:
>>>
>>> # netstat -rn
>>> Kernel IP routing table
>>> Destination     Gateway         Genmask         Flags   MSS Window
>>>  irtt Iface
>>> 10.254.250.224  0.0.0.0         255.255.255.224 U         0 0
>>>     0 eth1
>>> 10.1.3.0        0.0.0.0         255.255.255.0   U         0 0
>>>     0 eth0
>>> 0.0.0.0         10.1.3.1        0.0.0.0         UG        0 0
>>>     0 eth0
>>
>> What host are you trying to "ping"?
>
>
>
>