Link 2 computers by wifi with httpd allows only one way trafic
Hello all.
I have a small problem, I'm trying to connect two computers directly creating in one of them an AP using hostapd.
I more or less followed this: https://www.linux.com/learn/tutorials/442417-create-a-secure-linux-based-wireless-access-point
I've managed to create my AP without trouble and connected my other computer to it, but they cannot ping each other.
At first I thought it was a problem assigning IP's, so I decided to use static IP so I don't have to use a dhcp sever.
My client is 192.168.128.100 with netmask 255.255.255.0 and my AP is 192.168.128.1 with the same netmask.
I configurated them using ifconfig wlan0 129.168.127.XXX netmask 255.255.255.0
So I tcpdumped both connections to see what was going on and ping'ed.
If I ping from my AP to the other computer:ping -I wlan0 192.168.128.100
I get this in my AP's tcpdump (using tdpdump -i wlan0):ARP, Request who-has 192.168.128.100 tell 192.168.128.1, length 28
Nothing else, no reply nor anything.
But, in my client's tcpdump I get:
ARP, Reply 192.168.128.100 is-at XX:XX:XX:XX:XX:XX (oui Unknown), length 28
So my AP is not receiving the reply but my client receives the ping request.
If I do it the other way (Ping from the client to the AP) the client tcpdump shows that it is trying to send the ARP request, but the AP does not log anything at all.
I'm confused. I don't really know much about networking but I feel that something odd happens here. For example, the AP does receive some data because I can connect both computers and hostapd shows that the authentication is correct.
My AP is OpenSuse 11.4 and the client right now is BackTrack linux, but later I plan to use a debian and a windows computer as clients.
Also, I've been using linux for a long time, but with my wifi I've always used some kind of GUI like kdenetworkmanager so I don't really know how to do everything properly with the console, and maybe I'm skipping something important.
I stopped my firewall in the AP just in case.
Thank you very much in advance!
Comments
-
Hello nake,
I was just reading the tutorial you linked to. The information is very technical. From what you posted, it looks like your Wifi-card has a static address(wlan0 129.168.127.XXX) which is not in the same network as your AP(192.168.128.1). Could you run "ifconfig" on both systems and post the output of the command?0 -
I saw the same simple issue, looks like a simple typo, but could also be your problem. Let us know0
-
I'm not sure if I did that typo while posting it here or it was in the computers I was trying to connect. However I'm on holidays this week so I wont be able to try it now.
Thanks for the fast answer though! As soon as I try it I'll post it here.0 -
Nope, the problem persists.
I'm starting to think it might be some kind of problem with the packet's routing over the kernel.
I started a dhcpd daemon just to make sure I was not screwing some kind of ip assignment, my config looks like this:option routers 192.168.128.1; option subnet-mask 255.255.255.0; option broadcast-address 192.168.128.255; option netbios-name-servers 192.168.128.1; default-lease-time 86400; max-lease-time 86400; authoritative; subnet 192.168.128.0 netmask 255.255.255.0 { range 192.168.128.100 192.168.128.200; }
I started the daemon with dhcpd wlan0 (and the leases file exists). No errors seem to show up.
Then, in my client (linked with wpa_supplicant) I run dhclient wlan0 and it tries to send messages but none of them arrive to my ap. I saw in tcpdump that it sends packets to 255.255.255.255 but they get not logged in my ap's tcdump... In the end it said that no DHCPOFFERS where received.
Also, as I said, if I ping from the AP to the client ping requests do arrive, but the reply from the client to the AP does not arrive to the AP. That's why I'm starting to think that the problem is that my ap is rejecting or dropping packets.
I don't know how to check if that's my problem. As my AP is opensuse I rechecked in yast that my firewall is disabled, but as far as I know there could be other kind of firewalls like iptables and configuration files to reject connections and packets, but I don't know how to check and change those. Any ideas?
If I can I'll try to do the same with another computer as AP to see if the problem is a misconfiguration somewhere.0 -
I am facing the same issue. I have my AP hosted on Alpine Linux and connecting using Ubuntu. My WiFi connection is successful but both the systems cannot ping each other.
0
Categories
- 10.1K All Categories
- 35 LFX Mentorship
- 88 LFX Mentorship: Linux Kernel
- 501 Linux Foundation Boot Camps
- 278 Cloud Engineer Boot Camp
- 103 Advanced Cloud Engineer Boot Camp
- 47 DevOps Engineer Boot Camp
- 40 Cloud Native Developer Boot Camp
- 2 Express Training Courses
- 2 Express Courses - Discussion Forum
- 1.7K Training Courses
- 17 LFC110 Class Forum
- 4 LFC131 Class Forum
- 19 LFD102 Class Forum
- 148 LFD103 Class Forum
- 12 LFD121 Class Forum
- 61 LFD201 Class Forum
- LFD210 Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- 23 LFD254 Class Forum
- 566 LFD259 Class Forum
- 100 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 1 LFS145 Class Forum
- 22 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 1 LFS203 Class Forum
- 43 LFS207 Class Forum
- 298 LFS211 Class Forum
- 53 LFS216 Class Forum
- 46 LFS241 Class Forum
- 40 LFS242 Class Forum
- 37 LFS243 Class Forum
- 10 LFS244 Class Forum
- 27 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- 131 LFS253 Class Forum
- 993 LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 87 LFS260 Class Forum
- 126 LFS261 Class Forum
- 31 LFS262 Class Forum
- 79 LFS263 Class Forum
- 15 LFS264 Class Forum
- 10 LFS266 Class Forum
- 17 LFS267 Class Forum
- 17 LFS268 Class Forum
- 21 LFS269 Class Forum
- 200 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- 212 LFW211 Class Forum
- 153 LFW212 Class Forum
- 899 Hardware
- 217 Drivers
- 74 I/O Devices
- 44 Monitors
- 115 Multimedia
- 208 Networking
- 101 Printers & Scanners
- 85 Storage
- 749 Linux Distributions
- 88 Debian
- 64 Fedora
- 14 Linux Mint
- 13 Mageia
- 24 openSUSE
- 133 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 355 Ubuntu
- 472 Linux System Administration
- 38 Cloud Computing
- 69 Command Line/Scripting
- Github systems admin projects
- 94 Linux Security
- 77 Network Management
- 107 System Management
- 49 Web Management
- 63 Mobile Computing
- 22 Android
- 27 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 527 Off Topic
- 127 Introductions
- 213 Small Talk
- 19 Study Material
- 794 Programming and Development
- 262 Kernel Development
- 498 Software Development
- 922 Software
- 257 Applications
- 182 Command Line
- 2 Compiling/Installing
- 76 Games
- 316 Installation
- 52 All In Program
- 52 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)