LinuxQuestions.org - unable to ping between my Fedora server and my laptop via wireless

- Linux - Wireless Networking (https://www.linuxquestions.org/questions/linux-wireless-networking-41/)

- - unable to ping between my Fedora server and my laptop via wireless (https://www.linuxquestions.org/questions/linux-wireless-networking-41/unable-to-ping-between-my-fedora-server-and-my-laptop-via-wireless-686395/)

unable to ping between my Fedora server and my laptop via wireless

My home setup: Fedora 9 server (connected via cable to DSL modem as IP address 1.2.3.4 over ETH1) and several WinXP boxes and laptops, all connected via CAT-5 using the 192.168.2.x subnet over ETH0.

I want to move my laptop (built-in wireless which works fine) upstairs, so I added a Linksys card to my server, configured it as an Ad-Hoc 192.168.3.1, added it to the firewall and masquerade, updated my routing tables . . . but I can't use it. Mechanically everything is fine and the laptop can see it and even connects, but nothing pings in either direction. Obviously I am doing something stupid; more accurately, I am _not_ doing something.

I must be missing a necessary step. I've read the FAQs and the HowTos but none of them explicitly describe what I'm trying to do. Do I need a separate router? Do my routing tables suck? Is using "Ad-Hoc" wrong for this scenario? (For now, I'm skipping both authentication and encryption --- I'll enable those when the basic connection is working.)

Thanks for your time. Pointers to appropriate docs appreciated.

ok
dpm

Code:

# lspci -v -s 3:0.0 

03:00.0 Network controller: RaLink RT2561/RT61 802.11g PCI

        Subsystem: Linksys WMP54G ver 4.1

        Flags: bus master, slow devsel, latency 64, IRQ 16

        Memory at fd9f8000 (32-bit, non-prefetchable) [size=32K]

        Capabilities: [40] Power Management version 2

        Kernel driver in use: rt61pci

        Kernel modules: rt61pci



# ifconfig wlan0

wlan0    Link encap:Ethernet  HWaddr 00:18:39:14:C6:3F

          inet addr:192.168.3.1  Bcast:192.168.3.255  Mask:255.255.255.0

          inet6 addr: fe80::218:39ff:fe14:c63f/64 Scope:Link

          UP BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:119 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:0 (0.0 b)  TX bytes:17763 (17.3 KiB)



# iwconfig wlan0

wlan0    IEEE 802.11  ESSID:"MYWLAN"  

          Mode:Ad-Hoc  Frequency:2.437 GHz  Cell: 9A:8A:39:E2:DB:EA

          Tx-Power=18 dBm

          Retry min limit:7  RTS thr:off  Fragment thr=2352 B

          Encryption key:off

          Link Quality:0  Signal level:0  Noise level:0

          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0

          Tx excessive retries:0  Invalid misc:0  Missed beacon:0



# route -n

Kernel IP routing table

Destination    Gateway        Genmask        Flags Metric Ref    Use Iface

0.0.0.0        192.168.3.1    255.255.255.255 UGH  0      0        0 wlan0

0.0.0.0        192.168.2.1    255.255.255.255 UGH  0      0        0 eth0

192.168.3.0    0.0.0.0        255.255.255.0  U    0      0        0 wlan0

192.168.2.0    0.0.0.0        255.255.255.0  U    0      0        0 eth0

1.2.3.0        0.0.0.0        255.255.255.0  U    0      0        0 eth1

192.168.122.0  0.0.0.0        255.255.255.0  U    0      0        0 virbr0

169.254.0.0    0.0.0.0        255.255.0.0    U    0      0        0 wlan0

0.0.0.0        1.2.3.1        0.0.0.0        UG    0      0        0 eth1



#

Quote:

Originally Posted by dpmlq (Post 3355567)

Code:

# iwconfig wlan0

wlan0    IEEE 802.11  ESSID:"MYWLAN"  

          Mode:Ad-Hoc  Frequency:2.437 GHz  Cell: 9A:8A:39:E2:DB:EA

          Tx-Power=18 dBm

          Retry min limit:7  RTS thr:off  Fragment thr=2352 B

          Encryption key:off

          Link Quality:0  Signal level:0  Noise level:0

          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0

          Tx excessive retries:0  Invalid misc:0  Missed beacon:0

I'm not sure what your problem is and I have never done ad-hoc, but the higlighted line certainly looks wrong to me. Are you sure the two machines are really connected?

A wireless router would certainly be another option. I am using one just to connect wireless and wired machines together w/o even using the port that is designated for the Internet (or WAN). I also disabled DHCP so it simply functions as a switch with wireless capability.

I've got a very similiar setup and I think the same problem.
I want to use my Linux box as an AP for my notebook (a Macbook, running MacOSX 10.5).

Arch Linux, 3 Interfaces:
1 for the local wired net.
1 for dsl
1 for local wlan.

Code:

ifconfig wlan0

wlan0    Link encap:Ethernet  HWaddr 00:1D:0F:B5:29:C3  

          inet addr:192.168.3.1  Bcast:192.168.3.255  Mask:255.255.255.0

          inet6 addr: fe80::21d:fff:feb5:29c3/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:40 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 b)  TX bytes:3816 (3.7 Kb)

Code:

iwconfig wlan0

wlan0    IEEE 802.11bg  ESSID:"macbook"  

          Mode:Ad-Hoc  Frequency:2.412 GHz  Cell: 2E:B6:78:36:D0:A8  

          Tx-Power=27 dBm  

          Retry min limit:7  RTS thr:off  Fragment thr=2352 B  

          Encryption key:off

          Power Management:off

          Link Quality:0  Signal level:0  Noise level:0

          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0

          Tx excessive retries:0  Invalid misc:0  Missed beacon:0

cat /sys/class/net/wlan0/carrier output is 1, which (as I've read elsewhere on the forum) should indicate that wlan0 is up and connected to a network (although: what does that mean for adhoc mode?)

I can see the network from my macbook, I can connect to it from the macbook. As soon as I have connected
i do from my linux box

Code:

iwlist wlan0 scan

wlan0    Scan completed :

          Cell 01 - Address: 2E:B6:78:36:D0:A8

                    ESSID:"macbook"

                    Mode:Ad-Hoc

                    Channel:1

                    Frequency:2.412 GHz (Channel 1)

                    Quality=56/100  Signal level:-53 dBm  Noise level=-89 dBm

                    Encryption key:off

                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s

                              11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s

                              48 Mb/s; 54 Mb/s

                    Extra:tsf=00000000ad6b5279

                    Extra: Last beacon: 10ms ago

Quote:

Originally Posted by c31c (Post 3358785)

I've got a very similiar setup and I think the same problem.

I notice that your device shows as RUNNING in the `ifconfig` output but mine does not. I wish I knew how meaningful that is.

ok
dpm

Yes, good catch! I don't know what 'RUNNING' signifies.

BUT: I got it working yesterday night.
First, it might have been a firewall issue (on the MacBook side).
Second, after deactivating the Mac firewall, I tested various Channels (Frequencies, right?) and (Transmit Rates).
I have an Atheros Chipset (AR2413), and it seems the new in-kernel driver ath5k doesn't have support for all features and all rates, yet.

I got good results with 24M, which is almost half of what this card should be able to do, but hey.

Some notes on Ad-Hoc:

man iwconfig says about the display of Signal level, Noise level: "In Ad-Hoc mode, this may be undefined and you should use iwspy."

Well, my Card doesn't support iwspy, or the driver doesn't, but maybe it will work for you. :)

Good luck
Cheers
c31c

Thanks for the update and the report on what the man page says about my concern in post #2.

FYI, after reading dpmlq's post, I tried searching for information about RUNNING. Everything I could find lumped it together with UP. If anybody reading this knows the distinction between UP and RUNNING, I (and probably others) would sure like to hear it!