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A Newbie question. curious to know more about networking. When I digging
into my new hardy, I didn't see /dev/eth0 file. But everything works
perfectly. below are some findings.
[EMAIL PROTECTED]:~$ lspci | grep 'Ethernet'
00:0a.0 Ethernet controller: nVidia Corporation MCP67 Ethernet (rev a2)
[EMAIL PROTECTED]:~$ ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:1b:24:9b:49:0b
inet addr:192.168.1.25 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::21b:24ff:fe9b:490b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:45706 errors:0 dropped:0 overruns:0 frame:0
TX packets:38336 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:60497368 (57.6 MB) TX bytes:3664246 (3.4 MB)
Interrupt:220 Base address:0x4000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:194 errors:0 dropped:0 overruns:0 frame:0
TX packets:194 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9700 (9.4 KB) TX bytes:9700 (9.4 KB)
But,
[EMAIL PROTECTED]:~$ cat proc/devices | grep eth*
cat: proc/devices: No such file or directory
and
[EMAIL PROTECTED]:~$ find /dev -name '*eth*'
[EMAIL PROTECTED]:~$
gives nothing about eth0 interface. but /sys tells the different story,
[EMAIL PROTECTED]:~$ find /sys -name '*eth*'
/sys/devices/pci0000:00/0000:00:0a.0/net/eth0
/sys/bus/pci/drivers/forcedeth
/sys/class/net/eth0
/sys/module/forcedeth
/sys/module/forcedeth/drivers/pci:forcedeth
[EMAIL PROTECTED]:~$ udevinfo --attribute-walk
- --path=/sys/devices/pci0000:00/0000:00:0a.0/net/eth0
Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/pci0000:00/0000:00:0a.0/net/eth0':
KERNEL=="eth0"
SUBSYSTEM=="net"
DRIVER==""
ATTR{addr_len}=="6"
ATTR{iflink}=="2"
ATTR{ifindex}=="2"
ATTR{features}=="0x20"
ATTR{type}=="1"
ATTR{link_mode}=="0"
ATTR{address}=="00:1b:24:9b:49:0b"
ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
ATTR{carrier}=="1"
ATTR{dormant}=="0"
ATTR{operstate}=="up"
ATTR{mtu}=="1500"
ATTR{flags}=="0x1003"
ATTR{tx_queue_len}=="1000"
looking at parent device '/devices/pci0000:00/0000:00:0a.0/net':
KERNELS=="net"
SUBSYSTEMS==""
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:0a.0':
KERNELS=="0000:00:0a.0"
SUBSYSTEMS=="pci"
DRIVERS=="forcedeth"
ATTRS{vendor}=="0x10de"
ATTRS{device}=="0x054c"
ATTRS{subsystem_vendor}=="0x103c"
ATTRS{subsystem_device}=="0x30cf"
ATTRS{class}=="0x020000"
ATTRS{irq}=="220"
ATTRS{local_cpus}=="ff"
ATTRS{modalias}=="pci:v000010DEd0000054Csv0000103Csd000030CFbc02sc00i00"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
In /dev/net there is on 'tun' interface. But `udevinfo` tells nothing
about it.
[EMAIL PROTECTED]:~$ udevinfo --query=all --name=/dev/net/tun
node name not found
[EMAIL PROTECTED]:~$ ls /dev/net/
tun
I am confused with these informations. I googled to know more about
tun/tap But my knowledge in networking is not enough to grab it. It will
be helpful to me if gurus in our mailing-list teach me (or guide me to
some links) how the networking subsystem in 2.6 kernal works( in layman
term).
Thanks in advance.
Mohan R
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