IPTables and forward
Marco A. Ramos
mramos at sanyoval.net
Wed Oct 27 20:56:37 UTC 2004
Ok, I was wrong, I look it the error on Iptables (because Im new using it I
thought that I put something wrong), well that I found is RX (reception)
errors on the eth0.
This is that ifconfig show:
eth0 Link encap:Ethernet HWaddr 00:C0:9F:46:25:97
inet addr:101.32.212.53 Bcast:101.32.212.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4329 errors:2843 dropped:0 overruns:0 frame:1590
TX packets:6536 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:309036 (301.7 Kb) TX bytes:2020769 (1.9 Mb)
Interrupt:18 Base address:0xece0 Memory:fe1e0000-fe200000
As you can see, there is 3843 errors. On the RX, the streigs think, its
that I can received smaller files then 700b, greater files are loosing, and
other smaller files pass but they arrive empty.
First I change the network cable, but it not work..
There is two equal cards eth0 and eth1, when eth1 is working perfectly, so I
try to found any difference on the driver, PCI or IRQ configuration, but the
only difference found is that the eth0 (bad card) appear in the /proc/pci
file as No bursts and the eth1 (good) card appear as Latency=32, and dont
know what it mean or how can I change it.
Any one know some about it?
This are some related files.
/proc/pci report:
Ethernet controller: PCI device 8086:1075 (Intel Corp.) (rev 0).
IRQ 18.
Master Capable. No bursts. Min Gnt=255.
Non-prefetchable 32 bit memory at 0xfe1e0000 [0xfe1fffff].
I/O at 0xece0 [0xecff].
Bus 3, device 2, function 0:
Ethernet controller: PCI device 8086:1076 (Intel Corp.) (rev 0).
IRQ 21.
Master Capable. Latency=32. Min Gnt=255.
Non-prefetchable 32 bit memory at 0xfdee0000 [0xfdefffff].
I/O at 0xdcc0 [0xdcff].
Bus 3, device 3, function 0:
Ethernet controller: Davicom Semiconductor, Inc. Ethernet 100/10 MBit
(rev 49).
/proc/interrupts report:
CPU0 CPU1
0: 4243967 4241237 IO-APIC-edge timer
1: 4 0 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 0 IO-APIC-edge rtc
12: 28 0 IO-APIC-edge PS/2 Mouse
14: 21 0 IO-APIC-edge ide0
15: 62241 52518 IO-APIC-edge libata
16: 0 0 IO-APIC-level usb-uhci
18: 10959 41562 IO-APIC-level eth0
19: 0 0 IO-APIC-level usb-uhci
21: 208689 0 IO-APIC-level eth1
22: 8 197601 IO-APIC-level eth2
23: 0 0 IO-APIC-level ehci-hcd
NMI: 1 0
LOC: 8484883 8484882
ERR: 0
MIS: 0
/proc/ioports report:
d400-d4ff : ATI Technologies Inc Rage XL
d800-d8ff : Davicom Semiconductor, Inc. Ethernet 100/10 MBit
d800-d8ff : dmfe
dcc0-dcff : PCI device 8086:1076 (Intel Corp.) (good card)
dcc0-dcff : e1000
e000-efff : PCI Bus #01
ece0-ecff : PCI device 8086:1075 (Intel Corp.) (bad card)
ece0-ecff : e1000
Thank you so much.
Regards.
-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com]On Behalf Of Marco A. Ramos
Sent: Wednesday, 13 October, 2004 11:37 AM
To: redhat-list at redhat.com
Subject: IPTables and forward
Hello, every one!
I have a problem using Iptables and Forward.
First some data to explain the problem
OS: RedHat Enterprice 3 WS
Use of service: transmit small text files using sockets, the sofware contact
the remote server, transmit the file and disconnect it.
Connection: From a Linux Server to a Remote Unix Server using Frame Relay
Technology.
This schemes was working perfectly for two year:
Server Router -----FrameRelay----Router---Other equipmentServer
<--------- Transmitting and receiving connections --------->
But for some requirements we have to add en LinuxServer before the remote
other equipment:
Server Router --FrameRelay--Router--New Linux Server---Other
equimentServer
<--------- Transmitting and receiving
connections ---------------------------->
The new Linux server, must to make NAT, forward and redirect connections,
using IPtables.
The problems is, since we add the new server, we start to have tree
problems: 1) loose some connections; 2) The connection some time is slowly;
and 3) some files are transmit it empty.
I reduce the function of the New Linux Server to just make forward (the
connection get in from one network card and get out from other) with out any
security rule, but the problem still happen.
Any idea?
Thank you so much, regards.
Marco Antonio Ramos
Centro de Prevalidación
mramos at sanyoval.net
(664) 647-44-66/25/44
Fax: (664) 647-44-33
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