From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc D Ronell Subject: Re: Network access fails unless tcpdump is running? Date: Thu, 01 Mar 2007 15:54:58 -0500 Message-ID: <87ps7s4rbx.fsf@corps.glidepath.invalid> References: <87y7mg4vm7.fsf@corps.glidepath.invalid> <20070301201307.GC3199@gospo.rdu.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: netdev@vger.kernel.org Return-path: Received: from main.gmane.org ([80.91.229.2]:37222 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030237AbXCAUzi (ORCPT ); Thu, 1 Mar 2007 15:55:38 -0500 Received: from list by ciao.gmane.org with local (Exim 4.43) id 1HMsJI-00052t-4W for netdev@vger.kernel.org; Thu, 01 Mar 2007 21:55:32 +0100 Received: from pool-71-255-169-178.bstnma.east.verizon.net ([71.255.169.178]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 01 Mar 2007 21:55:32 +0100 Received: from mronell by pool-71-255-169-178.bstnma.east.verizon.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 01 Mar 2007 21:55:32 +0100 Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Andy Gospodarek writes: > On Thu, Mar 01, 2007 at 02:22:24PM -0500, Marc D Ronell wrote: >> >> Hi, >> >> I can not ping a remote host successfully unless I have "tcpdump -i >> eth0" running, in which case, my network access works fine. > > Interesting that when your interface is in promiscious mode it works > fine, but otherwise it doesn't. Do you have all of your iptables rules > cleared? > Thanks very much for your reply and interest. I find this an odd problem. The output of iptables -L looks like: caviar:/tmp# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination The machine name is caviar on the prompt. There are no rules in place. AFAIK, there are no firewalls running. Changing the routing table did not help the situation. >> I am running Debian etch on a Dell Inspiron e1505 laptop. The eth0 >> address is static on my local LAN. Once tcpdump is running, the >> laptop can access the network with no problems. > > What networking hardware is on that laptop? Can you post the complete > output of `ethtool -i eth0` and the network device info from the output > of `lcpci -vvv`? lspci output is attached below. caviar:/tmp# lspci -vvv 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express Memory Controller Hub (rev 03) Subsystem: Dell Unknown device 01bd Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- SERR- TAbort- SERR- TAbort- Reset- FastB2B- Capabilities: [88] Subsystem: Dell Unknown device 01bd Capabilities: [80] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+ Address: fee00000 Data: 40c1 Capabilities: [a0] Express Root Port (Slot+) IRQ 0 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag- Device: Latency L0s <64ns, L1 <1us Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported- Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- Device: MaxPayload 128 bytes, MaxReadReq 128 bytes Link: Supported Speed 2.5Gb/s, Width x16, ASPM L0s L1, Port 2 Link: Latency L0s <256ns, L1 <4us Link: ASPM L1 Enabled RCB 64 bytes CommClk+ ExtSynch- Link: Speed 2.5Gb/s, Width x16 Slot: AtnBtn- PwrCtrl- MRL- AtnInd- PwrInd- HotPlug- Surpise- Slot: Number 1, PowerLimit 75.000000 Slot: Enabled AtnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- Slot: AttnInd Off, PwrInd On, Power- Root: Correctable- Non-Fatal- Fatal- PME- Capabilities: [100] Virtual Channel Capabilities: [140] Unknown (5) 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01) Subsystem: Dell Unknown device 01bd Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- SERR- TAbort- Reset- FastB2B- Capabilities: [40] Express Root Port (Slot+) IRQ 0 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag- Device: Latency L0s unlimited, L1 unlimited Device: Errors: Correctable- Non-Fatal- Fatal+ Unsupported- Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- Device: MaxPayload 128 bytes, MaxReadReq 128 bytes Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port 1 Link: Latency L0s <256ns, L1 <4us Link: ASPM L1 Enabled RCB 64 bytes CommClk+ ExtSynch- Link: Speed 2.5Gb/s, Width x1 Slot: AtnBtn- PwrCtrl- MRL- AtnInd- PwrInd- HotPlug+ Surpise+ Slot: Number 2, PowerLimit 6.500000 Slot: Enabled AtnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- Slot: AttnInd Unknown, PwrInd Unknown, Power- Root: Correctable- Non-Fatal- Fatal- PME- Capabilities: [80] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+ Address: fee00000 Data: 40c9 Capabilities: [90] Subsystem: Dell Unknown device 01bd Capabilities: [a0] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [100] Virtual Channel Capabilities: [180] Unknown (5) 00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01) (prog-if 00 [Normal decode]) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- Reset- FastB2B- Capabilities: [40] Express Root Port (Slot+) IRQ 0 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag- Device: Latency L0s unlimited, L1 unlimited Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported- Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- Device: MaxPayload 128 bytes, MaxReadReq 128 bytes Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port 4 Link: Latency L0s <1us, L1 <4us Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch- Link: Speed 2.5Gb/s, Width x0 Slot: AtnBtn- PwrCtrl- MRL- AtnInd- PwrInd- HotPlug+ Surpise+ Slot: Number 5, PowerLimit 6.500000 Slot: Enabled AtnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- Slot: AttnInd Unknown, PwrInd Unknown, Power- Root: Correctable- Non-Fatal- Fatal- PME- Capabilities: [80] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+ Address: fee00000 Data: 40d1 Capabilities: [90] Subsystem: Dell Unknown device 01bd Capabilities: [a0] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [100] Virtual Channel Capabilities: [180] Unknown (5) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 01) (prog-if 00 [UHCI]) Subsystem: Dell Unknown device 01bd Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- Reset- FastB2B- Capabilities: [50] Subsystem: Dell Unknown device 01bd 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01) Subsystem: Dell Unknown device 01bd Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- Region 1: I/O ports at Region 2: I/O ports at Region 3: I/O ports at Region 4: I/O ports at bfa0 [size=16] Capabilities: [70] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01) Subsystem: Dell Unknown device 01bd Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR-