Networking :: View MAC Of Recent Connections?
Jul 24, 2010
I've got a machine on my lan that's currently shutdown. I want to bring it online with WOL but for the life of me can't remember the mac. I have used that machine in the past to ssh into a server and do a few other things. My router doesn't log macs anywhere but in dhcp but the machine is configured statically. Is there any way I can get the mac of the machine or just send a magic packet to everyone, there are only a handfull of machine on the lan.
Oh, if it's applicable, the server is Debian Lenny and the machine to be waken up is Mint 9
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Feb 7, 2011
have a problem with my network-manager in ubuntu 10.10.when I dial one of my vpn connections, my other vpn connections be disabled and I can't use them!I tried to restart network-manager and gnome-panel, but it does't seem to solve this problem.
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Jul 9, 2010
Like many others it seems, my wireless has stopped working since a recent upgrade The answer does not lie in analysis of logs, settings etc. but surely with those who did it - they should provide a fix. I cannot believe everyone expects each individual users to go into their own analysis of why this is no longer working as it is clearly widespread. I have been using Ubuntu for 18 months without this problem on the same dual-boot laptop, and it still works on Windows as before, only Ubuntu 10.4 has recently stopped my network card from working.
I need to know when this will be fixed. I have been embarrassed by promoting Ubuntu to many colleagues who now also cannot work at home on their wireless networks. Seriously disillusioned I may start looking for a more stable alternative to Windows.
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Sep 4, 2010
I have an EEE 1000 that successfully connected to WPA networks until yesterday. I tried re-installing the RT2860 drivers that had been previously modified and did not have success.
Additionally, I just installed 10.04 on a Gateway laptop that's a few years old. It immediately connected to the WPA network and I ran the updater. Lo and behold, after updating it no longer connects to the network.
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Feb 18, 2011
This sux cause im new to ubuntu and it was working great on my laptop but after a recent update the wireless (wifi) connection just dies after 1 minute. The connection is still active, the icon shows full signal, nothing seems wrong at all, but there is no internet communication at all.
If I disconnect and reconnect I get proper internet comms for another minute, then it goes dead again!
This all started after a recent series of updates.
Computer:
Toshiba Satellite L505D-S5965
AMD Athlon X@ Dual Core QL-65
ATI RADEON 3100
Realtek RTL8187SE Wireless 802.11b/g 54Mbps PCIE Network Adapter
Realtek audio
Software:
Dual boot Vista (original factory installation) ubuntu added 2nd
All the latest kernals and non-beta releases as of 02/18/2011
I was almost ready to go all ubuntu, but I had to log back into vista to get internet to try and find help. ubuntu has been like this for weeks, but i havent had the time to try and find out what screwed the pooch on my wireless....
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Jun 18, 2011
i have a dell 1501 that has been upgraded from 10.10 to 11.04. everything was working okay. and then the user ran an upgrade recently. subsequently the wifi has mysteriously stopped working. it connects okay if one plugs it directly into the router but the wifi seems to have just stopped working.my mini 9 connects fine to the netgear wifi router using wireless.when i run the system tests for networking i get the errors..."root could not find def gateway info /proc""root could not find default gateway by running route"here is the output from some diagnostic commands.NOTE:this is similar to a post titled "wi-fi dead?" but the output is not quite the same...
lauren@lauren-Inspiron-1501:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
[code]....
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Sep 1, 2011
I have ubuntu 10.04. After update I performed yesterday, I could no longer access from other computers shared folders on my ubuntu machine. I checked update history and it included the following that appeared to be related to network shares:
Code:
libsmbclient (2:3.4.7~dfsg-1ubuntu3.4) to 2:3.4.7~dfsg-1ubuntu3.7
libpam-smbpass (2:3.4.7~dfsg-1ubuntu3.4) to 2:3.4.7~dfsg-1ubuntu3.7
samba (2:3.4.7~dfsg-1ubuntu3.4) to 2:3.4.7~dfsg-1ubuntu3.7
samba-common (2:3.4.7~dfsg-1ubuntu3.4) to 2:3.4.7~dfsg-1ubuntu3.7
[Code]..
I would prefer to use the latest version because it includes security updates. Does anyone know if there's some trick to getting network shares to work with the latest version of libsmbclient?
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Jan 21, 2011
Is it fair to say that connLimit and hashlimit are very similiar on Linux i.e. while hashlimit caters to limits for groups of ports, they both set the connection rate limit per host? How in IPTables, do I configure a policy that limits connections on a port that encapsulates the total sum of all connections from all hosts? i.e. I do not want to allow more than 6000conn/minute for port range that is the sum of all connecting hosts?
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May 30, 2011
I recently installed Fedora 15 now, and during installation I set the internet connection manually, then did update and after reboot, the internet connection settings have been removed. Now I can not set because the network connection to the Internet Connection is inactive. I mention that before the update was functional internet connection.
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Aug 23, 2010
Neither of my wired network connections are listed in the network manager applet. I know that networking seems to be functional since I can ping local devices on the network. I can't resolve DNS names however. I suppose this is because network manager usually handles DNS? I've posted the outputs of various configurations below.
Code:
/etc/NetworkManager/nm-system-settings.cfg
# This file is installed into /etc/NetworkManager, and is loaded by
# NetworkManager by default. To override, specify: '--config file'
# during NM startup. This can be done by appending to DAEMON_OPTS in
[code]....
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May 30, 2011
I have been working in macromedia dreamviewer for editing html and php files, Just now I moved to linux system by installing xampp , my question is that I need a best html and php editor that supports both the design view and code view as like in dreamviewer.
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Feb 27, 2010
I'm a bit confused about how ssh encrypts connections. I've read a few articles on ssh and they talk about 'keys pairs' (that is public and private keys) on the server and client computers. However, ssh doesn't seem to use these keys for encryption. What are the keys it uses? This question occurred to me when I was trying to make a remote login to an Ubuntu machine. From a remote login perspective, I haven't generated keys on my client machine and haven't enabled key based logins in ssh. (I use the default password based login). If there aren't any keys on my client, then how does encryption work?
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Jan 27, 2011
I just installed Fedora 14 in a hard disk of my PC. I installed MySQL also. I dontt know if this is the correct site for my question, but nobody MySQL related, have an answer yet. For MySQL accepting remote connections, my.cnf file must be edited (bind-address line or skip-networking line in that file). Well, that file in my Fedora-MySQL installation does not have such lines, so i assume, TCP/IP connections are allowed in MySQL. When i try to connect to the MySQL server it refuses the connection with the error 2003, that in short, means no TCP/IP connections are allowed. I disabled the firewall and retried but with no success, enabled the firewall again, and nothing happen. Is Fedora not accepting TCP/IP connections?
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Jan 3, 2011
Is there a way to restrict access for some users to connections from local network through SSH, and have other users that's permitted to log on from connections over the Internet?
E.g. John's laptop only have permissions to access the server on the local network, while Lucy can access the server both on the local network and from the Internet. (Through SSH in both cases)
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Sep 13, 2010
there is a cable connection and a wireless connection. Is it possible that I use the cable and the wireless to run a segmented download on both connections? Like half goes to wireless and the other half goes to the cable? Or if not the segmented download, then at least I surf the Internet with one and download on the other?
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Mar 1, 2011
OK, so, basically, not so long ago I had a modem + LAN cable kind of internet setup, and my friends and colleagues had no problem connecting to my Apache, ircd, etc.
But a few months ago my ISP changed it's policy, and now I have a single cable, plugged directly into the 'eth0' port, which connects to WAN (static IP) and, through PPPoE, to the net (dynamic IP). (Sorry, my knowledge in networking is close to nonexistent)
So, now there is a problem. My friends CAN still connect to my FTP and httpd on Windows XP, through both the external, dynamic IP, as well as the static WAN IP, but my Slackware (WAN IP is set up with DHCP, PPPoE - through pppoe-setup, with firewall at '0') is refusing access. No sings of connection is shown in the /var/log/access_log.
Also, VoiceChatter server DOES log the connection attempt, but it refuses connection, sending a 'Auth challenge', and then cutting connection. (The 'challenge' bit was never there before the new net setup)
All connections are done through WAN static IP (though test with netwide dynamic IP yield the same results =)
I run Slackware 13.1, didn't touch the firewall settings at all, and, as mentioned, pppoe firewall is set to '0' value.
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Jun 18, 2009
once I updated , there will be no connections to Internet in GUI , while it's available in TUI . So it's wired , huh ? Before upating, it's available both in TUI and GUI, though all the time the network-manager shows no connection , in fact , there is and both GUI and CUI . Now I updated , and it can't access Internet from GUI.
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Sep 1, 2010
Latest kernel update since Fedora 2.6.33 are mapping all my NFS "shares" twice (two sets of icons, etc.). All work, but why is this happening - was fine previously.
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Jan 12, 2010
When I click on the network manager icon next to the date in the upper right corner of my screen, my network connections do not show up. I have added two DSL connections on my laptop (username & password) but it doesn't show up. Everyday I need to use
Code:
sudo pppoeconf
if I wish to connect to the internet.
Both these connections are added in the same way on my Desktop Computer and it shows up on the network manager. One of them is even the default which connects automatically on startup.
Because it's not working I assume network manager is not compatible with my laptop. Are there patches to install or other programs that can easily manage my internet connection?
I'm using Ubuntu 9.10 on a not-so-new laptop.
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Jul 27, 2010
I have recently installed lucid 10.04, and I am having difficulty accessing my wireless. Following instructions to install the drivers for my wireless card, I always run into a problem when I need to configure my card. When I go to system-administration-network, there is no connections tab listed. I can only access General, DNS and hosts.
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Aug 15, 2010
Did ragemaw ever get that missing connections tab? Mine is missing too and furthermore wireshark cannot set up on any interfaces, because it cannot find them.
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Nov 14, 2010
So I'm going to try out opendns as an internet filter. But I'm not doing it on a network/router, just on my local machine. Using ubuntu, I read that I need to select each connection and change the dns settings.Is there a way to generically add the dns settings so that if I connect to a new network I don't have to manually update it's settings?
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Mar 24, 2011
I've got a Ubuntu Server Linux router that I've got 2 internet connections hooked to. One of them is DSL and the other is cable.
What I'd like to do is have everything go through the DSL connection EXCEPT for one desktop, I'd like that system to go through cable for everything.
Here's a diagram of how I've got things set up.
[URL]
I don't have any more expansion slots on the mainboard of my server for another NIC, also I do a lot of file transferring between a laptop and the desktop I want on the cable connection so I don't want that slowing down the rest of my network.
I've got both providers set up in the providers file and I've got everything going through the DSL connection right now. So far everything I've tried has stopped the desktop from connecting out at all.
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Nov 30, 2010
I would like to know if a rule has been applied to the iptables.active file to accept direct connections on port 22 through an IP address, can I also add a mac address/addresses to the rules such that if I am not on the network with the accepting IP address, that my MAC address will still get me in?
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Nov 2, 2010
is possible to use linux (especially slackware) to bond 2 (ethernet modems) adsl connections. For example if i have 2 connection of 24mbs download and 512 upload i will create achieve 48 mgps dowload and 1 mgps upload . something like that
adsl1 modem <------ eth1--- (slackbox router) --- eth0---> my server
adsl2 modem <------ eth2----
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Oct 1, 2010
One of our RHEL 5.3 servers has trouble about 30% of the time with TCP-based communications, but it does not seem to be firewall issues. From another computer on the same switch, you can SSH to the server sometimes and other times the SSH command will just hang. When it hangs, you can often just Ctrl+C and try it again and it works. Same with HTTP connections. You'll get part of a web page and then FireFox will just hang waiting for the rest and eventually time out. Same goes for communication initiated FROM the server. SSH'ing from the server to any outside server or connecting to any web site works sometimes, but most times not. iptables if off. No other firewalls are running. Tcpdump shows communication gets so far and then stops. It does not matter whether tou run tcpdump on that server or the client connecting to it. Either way you see the connection stops working. MEANWHILE, pinging with small or large packets works flawlessly. 10,000 packets, zero drops.
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Apr 13, 2009
We are having an issue with our application where once we start making a few hundred connections to our Linux server, our connections are staying in the established state. When our app is working fine, the client sends a basically a heartbeat every five minutes. It is all nice and clean, receives the FIN and shuts down and that's that. tcpdump as follows:
Code:
12:53:10.965206 IP serverA.xxx.xxx.com.40315 > serverB.xxx.xxx.com.1234: . ack 2 win 46 <nop,nop,timestamp 3299017001 2043788445>
12:58:10.892878 IP serverA.xxx.xxx.com.40322 > serverB.xxx.xxx.com.1234: S 494392992:494392992(0) win 5840 <mss 1460,sackOK,timestamp 3299316941 0,nop,wscale 7>
12:58:10.894882 IP serverA.xxx.xxx.com.40322 > serverB.xxx.xxx.com.1234: . ack 3318963465 win 46 <nop,nop,timestamp 3299316941 2044088355>
12:58:10.894886 IP serverA.xxx.xxx.com.40322 > serverB.xxx.xxx.com.1234: P 0:78(78) ack 1 win 46 <nop,nop,timestamp 3299316941 2044088355> .....
Then things start getting busy, and it ends up looking like this:
Code:
01:28:10.493760 IP serverA.xxx.xxx.com.41132 > serverB.xxx.xxx.com.1234: S 774853781:774853781(0) win 5840 <mss 1460,sackOK,timestamp 3344315513 0,nop,wscale 7>
01:28:13.491231 IP serverA.xxx.xxx.com.41132 > serverB.xxx.xxx.com.1234: S 774853781:774853781(0) win 5840 <mss 1460,sackOK,timestamp 3344318513 0,nop,wscale 7>
01:28:13.491755 IP serverA.xxx.xxx.com.41132 > serverB.xxx.xxx.com.1234: . ack 3597595480 win 46 <nop,nop,timestamp 3344318513 2089089105> ....
What could be the cause if the fin was received at 01:28:13.492743, but hours later this connection is still established:
gateway 16514 root 111u IPv4 2714750 TCP
serverB.xxx.xxx.com:1234->serverA.xxx.xxx.com:41132 (Established)
There is no corresponding connection in the client's netstat.
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Apr 17, 2010
I'm not sure if this is a Linux standard, but I've always understood that Linux restricts usage of ports below 1025 to root-user only. My question is why was this method developed?My theory is that it's to reduce the possibilty users who may not be as knowledgable with Linux from getting hacked. This is probably wrong though as ports 1025-66535 are available to any program as any user.
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Mar 17, 2010
Is there a way to log specific type of network connection with timestamp? I mean, if someone sends a mail through mail server, is there a way the server logs that connection with timestamp?
Example:
2010-03-17 14:10:12 <server>:25 <client1>:<port1>
2010-03-17 14:10:26 <server>:25 <client2>:<port2>
2010-03-17 14:13:09 <server>:25 <client3>:<port3>
2010-03-17 14:15:43 <server>:25 <client4>:<port4>
...
...
...
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May 23, 2011
I'd like to configure IPtables to make sure I can only access the internet through an openvpn connection (so when the connection is down I have no way to access the internet but to connect to the vpn again).
I know how to do this with Firestarter (restrictive outgoing policy and I only allow the vpn server IPs) but Firestarter seems to be stupid : for some reason eth0 was changed to eth1 and Firestarter can't work properly anymore, even though that probably can be fixed with Firestarter I'm no more interested in this program and I'd better like to know how to apply the same policy using IPtables.
I've tried a few things already but it failed each time ... how can I effectively allow my computer to connect to the VPN while everything else is blocked ?
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