Red Hat Bugzilla – Bug 28272
ping to gateway fails
Last modified: 2007-04-18 12:31:34 EDT
Problem: Cannont ping gateway with SDSL under RedHat Linux 7.0. I have an SDSL connection on a dual boot Win2k/RedHat 7.0 system (fresh Linux install kernel 2.2.16). My computer has dual 3Com 3C509B NICs. One configured for DSL access, one for my internal LAN. The DSL connection has a fixed IP address assigned by my ISP. The SDSL modem is a CopperRocket 201 (also sold by 3Com as a 3Com IDSL modem, now discontinued). I manually configured the dual NICs to disable Plug-n-Play and set the base address and IRQ. I can ping both NICs with no problem, but not the gateway. When I try to ping the gateway the data light blinks on the CopperRocket but there is no response. At this point I have read every network/routing source I can find on the internet but have no solution for this problem. A call to my ISP is pretty much futile. I have been told that this is a straight ethernet connection. This SDSL connection does not use PPPoE so rp-pppoe is not needed. One ISP tech suggested using Kppp to set up my SDSL as a modem. There is no device type to match the CopperRocket and a "Query Modem" only produced packet errors at the device. If you look at the output below you will see 2 default routes for the gateway. This was discussed in another bug report for the ifup script. I tried removing the GW info from ifcfg-eth0 and manually set routes with either metric of 1 or 0 with no success. I have also tried this with a single NIC with no success. I have also run TCPDUMP and received something like ARP who-has gw.address. I did not really know how to interpret this but it looked like it could not find out what owned the GW. In addition I have tested with packet_forwarding on/off. I hope that this is not really a bug because I was looking forward to using RedHat but without a connection to the internet it makes things very difficult. PatG --------------------------------------------------------------------------- - Command line output: # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 x.x.x.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 x.x.x.1 0.0.0.0 UG 0 0 0 eth0 0.0.0.0 x.x.x.1 0.0.0.0 UG 1 0 0 eth0 (note above that there are two routing entries for eth0 to the gateway. One with a metric of "0" and one with a "1". I have made no manual routing changes under this configuration. ifup script prob.) # ifconfig eth0 Link encap:Ethernet HWaddr 00:A0:24:24:34:66 inet addr:x.x.x.36 Bcast:x.x.x.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:45 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 Interrupt:7 Base address:0x2d0 eth1 Link encap:Ethernet HWaddr 00:A0:24:74:64:13 inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 Interrupt:10 Base address:0x2e0 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:3924 Metric:1 RX packets:81 errors:0 dropped:0 overruns:0 frame:0 TX packets:81 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0
Ok, I did some more testing. After thouroughly reading the Networking HOWTO my 3c509b I configured as follows 3c509b---- PnP disabled IRQ 7, IO 0x2d0 Tranceiver set to RJ45 PC BIOS---- PnP OS disabled I obtained a DSL router - Hawking PN9225 and set it up with my "other OS" to be a DHCP server. Verified operation with DHPC (I am connected with it now). Setup SDSL Modem--DSL router--Linksys Hub--NIC In RedHat booted to run level 3 did a ifdown eth0 and ifdown eth1 deleted /etc/.../ifcfg-eth0 deleted /etc/.../ifcfg-eth1 removed alias info from /etc/modules.conf removed gateway and DNS info from NETWORKS shutdown removed eth1 NIC reboot to run level 3 started x ran linuxconf set adapter eth0 driver 3c509 irq 7 set to DHCP Upon activating changes DHCP failed rebooted to run level 3 eth0 detected IRQ 7, IO 0x2d0 start eth0 failed lights on Linksys hub show activity on both NIC and DSL router port during eth0 DHCP request tried - # pump eth0 - still failed ran - # cat /proc/net/dev no errors reported for lo or eth0 I am at a loss on what to try next and have spent way too much time on this. If you could please look this over and provide some diagnostics I would be happy to help. Being new to Linux everything I try requires a steep learning curve. To me, this really looks like a driver issue, or some underlying confilt that is beyond my diagnostic skill. Here is the rest of my HW config for the record Abit VT6X4 MB http://www.abit-usa.com/english/product/motherboards/vt6x4.htm On board Via Audio driver lot loaded in RH7 (causes system freeze) Intel PIII 800E 100 MHz bus 256 MB Ram Elsa GeForce 256 AGP (4x AGP) Adaptec 2940 PCI SCSI Card Please email any correspondence Thank you, Pat
To get rid of the duplicate default gateway, move your GATEWAY= definition from ifcfg-ethX to /etc/sysconfig/network. The description of the bug is at: http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=19641 Try pinging with 'ping -n'. Do you still see problems?
I looked through my hardware pile and came up with a 3Com 3C905-TX PCI card. After installing it and setting it up everything is working fine. I entered the exact same net config info that I tried with the other card. My conclusion: One of the following problems exists. 1. There is a error in the 3C509B driver ...OR... 2. There is some odd compatability issue with the 3C509B and my other hardware under Linux. If RedHat would like me to do more testing (be reasonable) I will be glad to help. I have previously posted all of my hardware info. Thank You, PatG
Report on more testing: I scaped together more hardware. Intel Pentium 233 MMX on Matsonic MB 32 MB Ram S3 Virge/DX Video w/4MB Seagate 1.6 GB HD 3C509B NIC (wow, this system is a screamer!!!) Long story short. I installed TurboLinux 6.0 workstation (sorry) (Kernel 2.2.15) with just the basics, no X or other fancy stuff. After the install I configured the network just like I did before on the other computer. Everything worked great and I was able to get the NIC to ping to multiple places on the internet. So, based on my testing I say that there IS some obscure issue with my more recent hardware and the 3C509 driver. Is anyone interested? Pat
This might be already be fixed (if it is a driver issue) in newer releases, but all in all, this appears to be more of a kernel issue. Changing component.
Description fits an IRQ being used by PCI not set in BIOS for the ISA IRQ of the 3c509B. Old bug, not enough info to be worth keeping open so closing. Needless to say people experiencing similar bugs should still file a new bug about it