Ubuntu Networking :: PC Giving Strange Results When Being Pinged
May 27, 2011
Right then... all DHCP
PEGASUS 192.168.0.101
When being pinged from another PC aok, but also pings back on 192.168.0.100? When being pinged from itself using ping 192.168.0.101 (or 100) all is well - when pinged as ping PEGASUS is says following:
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=1 ttl=64 time=0.033 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=2 ttl=64 time=0.044 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=3 ttl=64 time=0.042 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=4 ttl=64 time=0.040 ms
^C64 bytes from localhost.localdomain (127.0.0.1): icmp_req=5 ttl=64 time=0.042 ms
The IP says its 127.0.0.1 (home) WTF is going on>. Why has PEGASUS been assigned 2 ips, and when pinging using HOSTNAME why does it point to home?
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Mar 16, 2010
I like the "Ubuntu" sudo philosophy and wanted to setup this sudo the same way on my Debian system. I was happy when I found that I just have to do the following:
-create a group 'admin'
-adduser christian admin
-visudo
-add the line: %admin ALL=(ALL) ALL
Then I tried sudo rm -rf / to check if sudo works. All worked fine. No, seriously, I can move around files that belong to the root and such, so sudo somehow works. But when creating new files with sudo, like e.g.
tar xzf myZippedTarball
these files belong to user 41034 and to the group users instead of root root:
drwxr-xr-x 7 41034 users 4096 2009-11-01 01:07 libsvm-2.9
Certainly, this is not the way I want to have. The user 41034 doesn't even show up in /etc/passwd...
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Jun 17, 2010
I don't think I changed anything in my system's configuration, but I wasn't able to access most of the websites. Some loaded perfectly, but for a vast majority of them, Firefox (And every other GUI browser - I tested Opera and Chromium) just showed me a never-ending loading screen. At first I thought it was my ISP, but on the same computer when I booted up Windows XP, everything worked fine.
I then booted Ubuntu back and tried pinging the nonaccesible domains - and they all work! Even weirded - for some of the domains the page's title gets loaded, and nothing more - even in something like 30 mins time. For some, I just get "Loading..." message. And some, as said earlier, work just fine. But I can ping all of them. I wanted to ask You about that issue, but ubuntuforums.org didn't even load. I then tried to use CLI browser links and it works just fine for all my sites and here I am, writing this topic from CLI mode in Terminal.
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Jul 11, 2010
My network is thus (verified with iwconfig and nm-tool):
Router1(dhcp) <---WDS---> Router2(forwards dhcp)
Router2 wireless has laptop1
Router2 wired has server1, server2
Laptop2 is a Dell Inspiron 1520 running Ubuntu 10.04 Desktop. It can always ping other networked devices. When it's wired, everything can ping it. When Laptop2 is wifi, only Router1 can ping it. Why?
Both routers are running DD-WRT v24-sp2 (10/10/09) std. Laptop1 (running Ubuntu 10.04 Netbook) can ping everything but Laptop2, and everything can ping it, whether wired or wifi.
[Code]...
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Oct 7, 2010
I am able to access internet, can ping other machines and can ssh into other machines. But cannot be pinged (it just hangs), and when trying to ssh into machine, it also hangs (no response)I checked the sshd daemon, it is not runningchkconfig --add sshdreboot, the sshd does not seem to come up.
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Apr 23, 2011
At my grandparents house, there is a Wi-Fi network that we can (sometimes) connect to. However, it lately hasn't been allowing our Win 7 laptops to connect. It does let my Wii and my iPod Touch connect with no problems. I've tried restarting, but that doesn't work. We don't have access to the router, so we can't reset that. I would really like this fixed since mobile Safari is not the best browser in the world and WiiNet is even worse..
Note: Neither of the laptops are mine (one is my sister's and one is my parents'). I would never allow a computer of mine to use such an operating system.
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Feb 21, 2010
I've set-up a Linksys WPC54G v5 wireless card using ndiswrapper and the appropriate Marvell driver. It seems to work ok. On my other laptop running Kubuntu with built-in wireless the routing all works fine - I just get prompted by Network Manager for the WPA passphrase and I'm away. However, when I try to connect to my wireless router on thix Xubuntu-based laptop I get really odd security options.
When I try to connect I get a security prompt asking me for a bewildering array of information. There are four basic authentication options under "WPA & WPA2 Enterprise": TLS, LEAP, Tunnelled TLS and Protected EAP. None of those offers a simple passphrase, they all have some combination of username & password with certificates and keys. If I try to connect to other networks in my area, some do just ask for a WPA passphrase, not that I know them to check!
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Nov 2, 2010
I just installed Ubuntu 10.10 yesterday, this is my first experience of Linux so I am a noob and have no idea how to go about troubleshooting this myself. I have been googling and searching forums for ages and have read a lot of threads of people having problems getting connected but have still to find anyone with the same issue I am having.
I managed to connect without any problem and I am not being periodically disconnected (which seems to be a frequent problem) but when I enter an address in firefox or click a link there is a 20-40 second delay before it will take me to the page, but once I am on the page if I click another link it will take me there straight away (as long as I am in the same tab, if I switch to a different window I have the 30 second delay again). Same with downloading files, when I click a download link it takes about half a minute to register that I have clicked, but once it establishes the connection my speeds are the same as they always are. speedtest.net is showing 8mbps, and the last file I downloaded came through at 900kbps once the connection established. It is very irritating since other than that I am loving Ubuntu and the more I read about Linux the more I want to drop my windows 7 altogether (running dual boot just now).
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Mar 9, 2011
I've been trying to use MySQL in Ubuntu but I've been having some connection issues and in trying to troubleshoot that, I observed this strange behavior with pings in Ubuntu Desktops inside our network.
- All Ubuntu Servers we have (10.10 and 8.04) behave as expected
- All Windows machines behave as expected
- All 5 Ubuntu Desktops we have, (10.10 and 9.10) exhibit the following unexpected behavior:
If they have a local ip addresses and are connected within the internal network, either to a switch or directly to a router, pings take much longer to be sent. It's not a higher lag, it's the time between each ping that increases. I have to wait for around 5 seconds for each ping, but the time in the ping reply is less than 100ms, also they're all in order so I assume it's the system delaying the sending of each ping.
If I plug a USB 3G modem directly then it works as expected again (~1 sec between each ping sent). Is this an intended feature, that depends on the network environment, or is this something I should look into more closely?
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Mar 31, 2010
Details:
1. Using XP Pro SP3 (32-bit)
2. Laptop = Sony VAIO VGN-FZ140E
3. Recently purchased a TP-Link Router (TL-WR740N) which claims to give 150 Mbps speed
When connected, my Intel Wireless WiFi Link 4965AGN shows a speed of only 65 Mbps . A friend came over with his laptop (having Windows 7) and was able to get 150 Mbps speed. I even compared and the same web sites were opening with considerable difference on our laptops. Do I need to upgrade the driver?
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May 5, 2011
If I have a desktop with a USB wifi adapter connected to the internet through an ethernet cable, is it possible to create a wireless network using the adapter that will allow other users to connect to the internet through mine? I'm in a fairly low-tech place for the next few weeks and getting a router isn't likely.
If it's possible, anyone have links or instructions for how to do it?
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Apr 6, 2010
I'm timing how long it takes to run a command foo. I'm looking to append the results from the time command to a file, and discard the results from the foo command. I tried the following, but it didn't do what I want:
$ time ./foo > /dev/null >> output_from_time_command.txt
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Feb 7, 2010
I added the following lines to my /etc/rc.local file:
Code:
ifconfig lo:0 10.10.10.1 netmask 255.255.255.0
ifconfig lo:1 10.10.10.2 netmask 255.255.255.0
[code]....
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Dec 12, 2010
I've a question about a connection to a shared folder on a pc behind an ubuntu 10.04 server. The Ubuntu machine itself is behind a Cisco router. Cisco router has a nat 1-to-1 to Ubuntu machine with the static public ip x.y.x.z The Ubuntu machine has one only interfaces eth0 bridged with a virtual tap0 in the virtual br0 interface. This because on the Ubuntu machine is running OpenVPN in bridged mode. I want to reach a private share on the host 192.168.100.2 using the x.y.w.z static IP. Is that possibile? Ubuntu machine has no firewall running (I was not able to run shorewall firewall for now).
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May 21, 2010
I have an old PC running an older version of linux with two network cards serving as my firewall router. The network cards are netgear 310tx cards. Noticed traffic was not getting routed at times. Figured my switch was going bad, so I hooked up an old hub to keep keys systems communicating while I get a new switch. No problems with hub, but only has 5 ports.
Get new switch (different make/model from old one), install, a couple of my systems have connectivity problems, but others do not. Thinking it was a bad switch, returned it, got a new one just like my old one (which I thought was going bad, but worked for several years). Hook it up, paying attention to my firewall console and notice martian header messages. Network traffic not getting routed at all. The interface for connected to LAN was slow to get started (my firewall can communicate to the Internet, but LAN communication was hosed).
System would "hang" spitting out martian header messages until I disconnected LAN cable. Thinking network card may be bad, replaced it with another version of the same type. Same problems: martian header messages and traffic not getting routed.
HOWEVER, if I remove the switch and use my old hub, no problems. Networking appears to work for all systems connected to hub. Since I and my wife work from home, I'm using the hub right now (with non-essential systems not connected due to limited ports). I can only do any real experimentation at night.
I have no idea why things would work differently between using a hub vs a switch. Could something have gone awry with the linux kernel (2.4.20-46.7)?
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Dec 22, 2010
I'm getting these strange answers from opera when I ask it what speed for download does it have. I am downloading fedora using ubuntu right now. Why opera tells me it's downloading with almost 200kb/s while the system monitor from ubuntu can't pass more than 110kb/s ...
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Jul 26, 2011
I am noticing the following output when running ifconfig:
[root@proxy log]# ifconfig -a
dev32758 Link encap:Ethernet HWaddr 00:xx:xx:xx:xx:xx
BROADCAST MULTICAST MTU:1500 Metric:1
[code]....
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Dec 14, 2010
I've noticed that when running an mtr (my traceroute) that sometimes some of the hops would light up. It will flash for about half a second then return back to its normal colour.I've search the net, but have not yet found an explanation as to what it means.
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Apr 28, 2011
I have a small ARM machine running an Arch linux variant, PlugApps. It was set up and working fine at my home, with a standard networking setup -- cable modem and router. I could do pretty much anything I needed to access the net fine.This machine is a remote monitoring system for another location. I shipped it to that location and am now trying to get it set up using another set of hands on site. There it is on the network behind a dsl modem and a router. I forwarded ports from the dsl modem to the router and from the router to the ARM computer.
In both cases the ARM machine is/was configured to use dhcp.So here's the deal:I can ssh into the ARM machine just fine.I can ping hosts on the wan fine (eg: stanford.edu).BUT:wget fails for not being able to resolve a valid address (eg: http://checkip.dyndns.org)the PlugApps package management system (pacman) cannot resolve the repository address the openntp time sync isn't working On the new network, I am able to connect to another client windows PC which has the same associated network info (Bcast address, Mask, etc. - comparing windows "ipconfig" vs linux "ifconfig" outputs) but which can resolve addresses for web browsing, etc.What am I missing? If it can resolve addresses for pings, why can't it work for other address requests? If I can ssh interact with it, why can't it connect to the net for other purposes?
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Oct 17, 2010
I usually start up my Internet service by typing ./rc.inet1. While its connecting I usually see my routers ip address then I connect and I start browsing and everything is fine. A few times I noticed that instead of seeing the routers address it showed some other address and I could not get online. I try ./rc.inet1 stop and renew but still cannot connect, I reboot and I then see the router and I can connect. I am using slackware13, and opera10 browser.
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Jan 25, 2011
I opened a thread on the general networking section of the forums to discuss about a problem I am experiencing with a newly installed slackware 13.1 (not 64b) on my dell laptop. Basically, the machine is not getting an IP from the dhcp server on my pfsense router. All other machines on my network are still getting IP's fine, and the pfsense box never changed. I can get an IP from the pfsense box by manually loging as root and using /etc/rc.d/rc.inet1 eth0 restart (note the argument eth0 necessary to get the ip).
User markush at the link below suggested I open this thread here, I think its a great idea since I believe it is a slackware problem. he also recommended to use tcpdump to diagnose the connection problem. Here's the results:
I issued the dhcp renewal commands in a terminal and monitored the output of tcpdump in a different terminal.
Code:
root@xpsm1730:/home/lpallard# /etc/rc.d/rc.inet1 restart
Polling for DHCP server on interface eth0:
dhcpcd: version 5.2.2 starting
dhcpcd: eth0: waiting for carrier
dhcpcd: timed out
[Code]....
I believe the router is fine since all other machines are all using slackware 13.1 (one slackware 32bit and the other slackeware 64) and are all handshaking perfectly with the pfsense box.
I also believe the kernel on the faulty machine is OK since I am using the very same kernel(2.6.37) on the machine running slack64 and this machine is also handshaking perfectly with my pfsense box.
Please see http://www.linuxquestions.org/questi...get-ip-857683/ for more details.
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Aug 31, 2010
I have upgraded to 10.04 from 9.10 after that, i get this strange issue.I have acutally asingned static address in the network manager applet.
Code:
mahiti@mahiti-admin:~$ sudo mii-tool -vv eth4
Using SIOCGMIIPHY=0x8947
[code]....
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Apr 3, 2010
I'm trying to setup a small network between my old and new laptops to transfer my personal data. They are now linked with a crossover cable and they see each other.The old one has a dual-boot setup with WinXp and Ubuntu 9.10.The new one with Win7 and Ubuntu 9.10.I tried samba but it was very slow even using Windows in both computers: maximum transfer rates were about 1,5 Mib/sec.I tried SSH using ubuntu on both pcs and it is reliable and much faster, 5 Mib/sec. But I wanted more...I installed the NFS server on the old one and exported the NTFS partition where my data resides with sync and ro options.
I installed the NFS client on the new one and i'm able to mount the remote partition.Now, when I transfer my files I get very high speed, more than 10 Mib/sec but after a while I get a "Stale NFS file handler" error but I really didn't touch any file in the old pc and the connection is always up.Searching on the web I found that NFS had some troubles exporting NTFS partitions in the past but should be fully compatible with them since the last versions of ubuntu.
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Jun 4, 2010
i am getting weird results after mounting the /home directory from the server. seems like the client sees the ldapuser and it's directory from the server side.. /home/ldapuser. but it's pulling the "blank" user as it's permission. blank is the actual user on the client side. any ideas why?
server side:
[root@localhost ~]# showmount -e
Export list for localhost.localdomain:
[code]...
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Jan 2, 2010
It scrolls jerky and sometime wont stop scrolling even after i only pushed the up or down arrow one time. it freezes up and take minuets to switch tabs or post to sites etc.Could this be a video driver issue? Or a Firefox issue? I am running Ubuntu 9.10 latest patches on and IBM R51
[Code]...
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Jan 23, 2010
I downloaded and installed the latest Firefox 3.6 on my Debian machine, but got this strange error when I fired it up for the first time:Code:firefox-bin: 1: Syntax error: "(" unexpected
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May 3, 2010
This happened to me first time when i installed VLC Player,and now it happens in QT Designer too I dont know if its relevant,but when i installed Ubuntu,i installed it in Serbian language (cyrilic) and than switched to English.
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May 29, 2010
notice at line 81 it goes rather strange - this goes on for another 9000 odd lines and looks like the set script is broken out and cat-ing to the screen - can't prove this as I've not been able to find the set script that is invoked...e.g.
uname@Sol:~$ set |head -200
BASH=/bin/bash
BASHOPTS=checkwinsize:cmdhist:expand_aliases:extgl
[code]....
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Jul 29, 2010
I had an odd thing occur after a fresh install of Ubuntu 10.04. I installed Windows 7 on its partition, and all went fine. Then I installed Ubuntu on its partition and everything was as it should be. Then I did the Ubuntu updates and now my boot window looks like this ... I can click on any of the Ubuntu logins and it takes me to the same place.
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Sep 8, 2010
I noticed yesterday, after what must have been the most recent updates, that my display now has a dark striped bar running down the right hand side of the display. It runs between the indicator applet and the deleted items bin on my standard Gnome desktop. I know it's not my monitor since I can see both of those items but maximised applications will not fill this area, even though the cursor is visible there.I've tried changing a number of display options but to no avail.
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