Question: card works fine, but 'tcpdump' cant see any of the traffic 

Forum: PCMCIA Network Adapter Issues
Date: 2000, Feb 17
From: Ron Flory <ron.flory@adtran.com>

hi- I've been using Dave's pcmcia stuff for a while now, (thanks Dave!). I have a PII RedHat 6.1 based laptop with a 10/100 network adapater that works just fine, however I'm a developer working with networks and I'd like to use the system for network sniffing. For some reason, tcpdump is not able to see any of the traffic on eth0, even traffic from this machine. tcpdump seems to work file on all my other machines (7-8 of various types), but for some reason its deaf on this one. Any hints? (something in /proc perhaps ?). I actually use ethereal as my packet sniffer, however since tcpdump is used by ethereal, and most everybody already has tcpdump, I'll reduce the problem to a single user program. Thanks- ron

[ Next-in-Thread ]  [ Next Message ] 

Messages Inline: [ 0 ]  [ All ]  Outline: [ 1 ]  [ 2 ]  [ All ] 

More: Untitled Re: Question: card works fine, but 'tcpdump' cant see any of the traffic (Ron Flory) Date: 2000, Feb 17 From: Ron Flory <ron.flory@adtran.com>

David Hinds wrote: > > On Thu, Feb 17, 2000 at 07:10:21AM -0800, Ron Flory wrote: > > > > tcpdump seems to work file on all my other machines (7-8 of various > > types), but for some reason its deaf on this one. > > What network card are you using? (which driver is at fault?) Hi Dave- The card is marked: Linksys EtherFast 10/100 PC Card model: PCMPC100 startup message from syslog: NE2000 Compatable: io 0x300, irq 3 .... its loading the 8390.o module, so its probably another (klunky 'ol) ne2000 clone. > I thought that most of the drivers implemented promisc support, but I > can't say I've ever used it myself. hmmm, good thought. When I startup tcpdump, I don't see the usual "eth0: Promiscuous mode enabled" message.... Apparently the promisc request isn't getting all the way through the driver- If it helps, here's some more info: kernel: 2.2.14 (unpatched, from master sources) Here is slightly filtered syslog: kernel: unloading PCMCIA Card Services kernel: Linux PCMCIA Card Services 3.1.10 kernel: kernel build: 2.2.14 #1 Wed Feb 9 10:25:19 CST 2000 kernel: options: [pci] [cardbus] [apm] kernel: PCI routing table version 1.0 at 0xf09a0 kernel: Intel PCIC probe: kernel: TI 1225 PCI-to-CardBus at slot 00:11, mem 0x7fffe000 kernel: host opts [0]: [ring] [pci + serial irq] [pci irq 11] [lat 66/176] [bus 2/2] kernel: host opts [1]: [ring] [pci + serial irq] [pci irq 11] [lat 66/176] [bus 3/3] kernel: ISA irqs (scanned) = 3,4,7,9,10,15 PCI status changes cardmgr[788]: starting, version is 3.1.10 cardmgr[788]: watching 2 sockets kernel: cs: IO port probe 0x1000-0x17ff: excluding 0x1000-0x10ff kernel: cs: IO port probe 0x0100-0x04ff: excluding 0x250-0x257 0x260-0x267 0x330-0x337 0x388-0x38f 0x4d0-0x4d7 kernel: cs: IO port probe 0x0a00-0x0aff: clean. cardmgr[788]: initializing socket 0 kernel: cs: memory probe 0xa0000000-0xa0ffffff: clean. cardmgr[788]: socket 0: Linksys EtherFast 10/100 Fast Ethernet cardmgr[788]: executing: 'insmod /lib/modules/2.2.14/net/8390.o' cardmgr[788]: executing: 'insmod /lib/modules/2.2.14/pcmcia/pcnet_cs.o' kernel: eth0: NE2000 Compatible: io 0x300, irq 3, hw_addr 00:E0:98:71:19:03 cardmgr[788]: executing: './network start eth0' kernel: eth0: found link beat I appreciate any ideas or info- Thanks- ron

[ Add Message ]  to: "card works fine, but 'tcpdump' cant see any of the traffic"

[ Members ]  [ Subscribe ]  [ Admin Mode ] 
[ Show Frames ]  [ Help for HyperNews at pcmcia-cs.sourceforge.net 1.10 ]