Debian Configuration :: SSH, Ping And ARP Not Working As They Should
Mar 13, 2010
i am running debian testing and the last few days i was trying to ssh to another pc on my network and i was getting an error like there was no machine with that ip! then i tried pinging to it with no luck! ARP was the only tool that returned the MAC address of the machine and that is strange i think. i realised then that i could only ping the gateway and localhost (127.0.0.1 not my ip). after editing my /etc/hosts, i could ping my ip as well. what is so wrong? here are some useful things:
my new /etc/hosts:
jack@debian:~$ cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 debian.local debian
[Code].....
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Apr 6, 2011
I have a debian server installed with a static ip. Now i am able to ping my ip, but when i try to configure a domain name with the nameserver as my ip, i am not able to ping the domain name
eg:
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Jan 23, 2010
I recently did a clean install of Debian 5, and a backup program called BackupPC. Both machines are on a small local network served by a router. Both machines have statically mapped IP addresses, done by the router via matching MAC addresses in a table of corresponding IP addresses (192.168.0.2 (HP-PC-XP), 192.168.0.3 (Debian). I configured Backup PC correctly (I think)...Upon running Backuppc, the first thing it tries to do when its time to run a backup is to ping the machine to be backed up. The name of the PC is stored in a backup pc config file. (I believe BackupPC does a DHCP request with the machine name to get the ip address, but not sure). Running the backup results in BackupPC tells me that it can't ping my xp machine. If I open up a terminal window in debian, i can successfully ping my xp machine when i use the ip address. 92.160.0.2 If I ping using the host name of the xp machine (e.g. HP-PC_XP), the ping command displays some ip address i've never seen...something like 63.123.155.104....how is it getting that and how can it be corrected?
I recall that nslookup looks at the local hosts file first to resolve the name....i look in my hosts file and found no such address (only contained localhost)....now what?
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Aug 27, 2015
I've been using Debian for about 6-7 months now. I've had a bit of a major networking problem for the past 4 months or so that I've been trying to fix - specifically, it started when I upgraded to Jessie. I can connect to wifi just fine, and sometimes I can even use the internet for brief periods of time (exceedingly rarely). Then... nothing. No network access, period. I can't ping any outside servers, I can't ping other computers on my network, and I can't even ping my router. Pages I try to load just stay "connecting" for all eternity, network printing fails, and so on.
So after four months of searching online (I've read through way more wireless documentation than I care to say), I finally gave up and admitted that maybe I screwed something up during upgrade to Jessie (as a matter of fact, I did, I had to do the upgrade in two increments [somehow] because my root partition was too tiny by mistake) and I did a clean install. Since I had /home on a separate partition, I was able to keep all my user files, but all settings regarding networking were wiped. So after installing firmware-iwlwifi so I can use my wireless card, I tried connecting to wireless! Success! Then I tried connecting to the internet... success! Briefly. The next morning I tried using the internet again, and it failed in exactly the same pattern as before.
I don't know much about what's going on here, but here's what I do have available:
I do have to use firmware-iwlwifi, which I installed by doing apt-get install firmware-iwlwifi. I don't think it's an issue with the wireless card itself (hardware-wise), the laptop dual-boots Windows 7 (that I never use anymore), and Windows 7 is able to connect to the internet just fine. Connecting directly to my router by ethernet cable works fine, I have perfect internet/network access then.
I can confirm that my laptop is receiving an IP address and that it is using ARP correctly to get the MAC address of my router (I confirmed this by doing the arp command, it has the MAC address correct, I checked from another computer with my router's config page) All other computers on my network work perfectly with my router. To confirm the router/its configuration isn't at fault, I did a full factory reset of the router, but to no avail.
Out of curiosity I tried installing Wireshark (using an ethernet cable to download it) to monitor what happens when I try to access a webpage. I'm no expert on networking, but I noticed something out place when I compare a capture from the affected computer to a capture from one operating normally - there are a lot of STP packets showing up. I did some checking around, it looks like STP is involved in bridging and more complex networking setups (involving switches, for example)... but it shouldn't be found on a home network, especially where there's no bridging whatsoever. These STP packets don't show up on packet captures done from any other computer. I've attached a packet capture from the affected computer here, since the forums won't let me attach a .pcapng file.
Here's the output from a few commands I ran during past troubleshooting sessions:
Code: Select allsudo ifconfig
eth0   Link encap:Ethernet HWaddr e0:db:55:b5:fe:06Â
     UP BROADCAST MULTICAST MTU:1500 Metric:1
     RX packets:12455 errors:0 dropped:0 overruns:0 frame:0
     TX packets:7781 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
[Code] ....
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Apr 8, 2010
I would like to ask something. Today my network Internet access suddenly slowed down, after inspecting the problem the hard way we disconnected one of our servers(ip=190, debian squeeze) from network and the network was alright again. When we plugged it back in, following symptoms were observed: computer 190 pinged gateway app. each 6th time. gateway(debian lenny) pinged computer 190 app each 6th time whole network Internet access was slowed down, local network functioned just fine
While pinging themselves, i ran iptraf on icmp packets on gateway and I saw what i thought was ping attack, lots of echo request coming from external address to computer 190. Blocking that address in iptables didn't help but restarting the gateway did, network Internet conenction is at full speed and gateway and computer 190 ping just fine.
My question is, what steps should I undertake in similar case (it's second time in 2 months) - to debug similar problems. Is it even possible for ping DOS to this kind of damage?
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Oct 13, 2010
I have a very strange problem.ometimes, yes sometimes not all the time, I get a Destination Host Unreachable when I ping a computer on my network. If I switch to root using su I can ping that same computer. Here is a screen shot:
joseph@laptop:~$ ping 192.168.1.14
PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
From 192.168.1.9 icmp_seq=2 Destination Host Unreachable
[code]...
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Feb 15, 2011
Just installed squeeze and noticing slow responses to ping. Ping with -n is fine, and as expected. Ping without -n is very slow to appear on the screen.
ben@WOPR:~$ ping google.com
PING google.com (74.125.230.114) 56(84) bytes of data.
64 bytes from 74.125.230.114: icmp_req=1 ttl=54 time=26.2 ms
64 bytes from 74.125.230.114: icmp_req=2 ttl=54 time=25.9 ms
64 bytes from 74.125.230.114: icmp_req=3 ttl=54 time=29.3 ms
64 bytes from 74.125.230.114: icmp_req=4 ttl=54 time=25.5 ms
^C64 bytes from 74.125.230.114: icmp_req=5 ttl=54 time=25.8 ms
--- google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 20199ms
rtt min/avg/max/mdev = 25.514/26.569/29.308/1.399 ms
ben@WOPR:~$ ping -n google.com
PING google.com (74.125.230.115) 56(84) bytes of data.
64 bytes from 74.125.230.115: icmp_req=1 ttl=54 time=25.6 ms
64 bytes from 74.125.230.115: icmp_req=2 ttl=54 time=26.0 ms
64 bytes from 74.125.230.115: icmp_req=3 ttl=54 time=26.8 ms
64 bytes from 74.125.230.115: icmp_req=4 ttl=53 time=21.5 ms
^C
--- google.com ping statistics ---
5 packets transmitted, 4 received, 20% packet loss, time 4006ms
rtt min/avg/max/mdev = 21.540/25.042/26.859/2.064 ms
I've tried disabling ip6, disabling avahi and adding options single-request to my /etc/resolv.conf - problem remains. If it helps when installing Squeeze was prompted to install firmware-realtek, which I didn't have. So downloaded onto usb from another machine installed once setup was complete.
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Oct 3, 2010
I was trying to get the Windows one working again. Here's what fdisk -l reads:
[Code]...
I'll change these or do some grub configurations, if anyone knows what ones can work.
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Jul 9, 2010
Ive got a problem on my server ....installed Debian 5 , Webmin and than syscp settung up syscp ready ....
I try to ping "localhost" ansver ping: unknown host
I try to ping "localhost." there is a host with IP 127.0.0.1
I need it to change it in "localhost"
Is that the bind9 maybe?
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Jul 15, 2011
I am using an virtual machine. where I need to ping from one machine to another. earlier I was able to ping. But after going to google.com once, I cannot ping back to this machine.
But if I gave ping -I eth1 <IP> then I can ping.
I cannot install any package, so tell me solution which includes not installing any package.
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Jul 17, 2009
I have a strange problem for internet. My clients (winxp - S2) can't get internet.Let me explain my scenerios. Fedora 10 with lan (eth0) having direct internet from dsl model, client (XP service pack 2) can use samba shares using dhcp (wlan0) installed in Fedora 10 box. client can ping my linux box.Now problem is: client (dosbox) can ping the google ip address (i.e ping 74.125.39.106) but can't use 'ping www.google.com'. That means ping with ip works for internet from my client. My linux box can. I can use internet from FC10 but can't use iexplorer from my client to have internet. I have enable ipmasquarding in Firewall and dhcpd is running on wlan0 for dynamic ip address of my clients.Can someone suggest me what kind of problem having I? What should i do to success iexplorer for internet? what possibly am i missing?
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Jul 6, 2015
I have install Debian 8.1.0 powerpc on a G5 2.0Ghz mac. It boots into a patchy square colour screen with no GUI. I am thinking there is a graphic driver problem so used (control +alt+f1) to enter the terminal and get the information below also tried to install nvidia-current but did not work. Have read that I need to blacklist nouveau drivers but don't know how this is done.
Graphics Card
[0300] : NVIDIA Corporation NV43 [Geforce 6600] [10de:0141] (rev a2) (prog-if 00 [VGA controller])
Computer
cpu PC970MP, altivec supported
clock : 2000.000000MHz
revision :1.1 (pvr 0044 0101)
timebas :33333333
Model owerMac11,2
machine owerMac11,2
motherboard owerMac11,2 MacRISC4 Power Macintosh
detected as :337 (Powermac G5 Dual Core)
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Jul 20, 2015
Debian Jessie on a raspberry pi 2
I'm trying to get nfs server working at boot up and it isn't starting because it says portmapper isn't running. I've read through a bunch of documentation on this and have gotten to the point that if the documentation tells me to Code: Select all$ apt-get install nfs-kernel-server portmap I usually stop there as it is outdated. I cant find a process doc that utilizes rpcbind. So, here is what I've done on my own:
setup /etc/exports with a proper nfs dir and exportfs it
Code: Select all$ apt-get install nfs-common nfs-kernel-server
$ sysv-rc-conf
---│ nfs-kerne$ [ ]   [X]   [X]   [X]   [X]   [ ]   [ ]   [ ]    │
---│ rpcbind   [ ]   [X]   [X]   [X]   [X]   [ ]   [ ]   [ ]    │
$ service rpcbind start
[Code] ....
The errors however don't seem critical as I'm able to mount the exported directory. OK so it appears to me that nfs server is working. However through a boot, the nfs-kernel-server and the rpcbind services are not starting. The nfs-kernel-server didn't start because rpcbind wasn't running. So I start rpcbind and then nfs-kernel-server and then nfs server works. So what am I missing? Why will rpcbind not start at boot?
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Jul 28, 2015
am not able to get internet working, am using debian testing. Dunno what is the issue. Here's the lowdown on /etc/network/interfaces :-
Code: Select all# This file describes the network interfaces available on your system# and how to activate them. For more information see interfaces (8)
#The loopback network interface
auto lo
iface lo inet loopback
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
I tried all the usual :-
Code: Select all$ sudo dhclient (this usually worked/works)
$ sudo ethtool eth0
$ sudo systemctl restart networking
[code]...
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Aug 18, 2015
I recently installed Debian 8 on my workstation , witch before ran ubuntu 15.04 , but after Debian 8 came, I have not succeeded running ssh with X11forwarding.
case is:
I have a server running ubuntu 14.04 , and when I login that server from my laptop ( also ubuntu 14.04 ), I have no problem getting x11forwarding working, but if I try login from my debian8 workstation, I'll get this error when trying to run xterm ( output is from ssh -X serverip )
connect /tmp/.X11-unix/X0: No such file or directory
xterm: Xt error: Can't open display: localhost:12.0
a ls show that the file exsist
$ ls -la /tmp/.X11-unix/X0
srwxrwxrwx 1 root root 0 Aug 18 17:53 /tmp/.X11-unix/X0
In the servers sshd_config i have the following options enabled
X11Forwarding yes
X11UseLocalhost yes ( i have tried both yes and no here )
X11DisplayOffset 12
and my ssh_config on my debian8 I have the following lines enabled
Host *
ForwardAgent yes
ForwardX11 yes
ForwardX11Trusted yes
As I see it with a 'ssh -vv -X serverip' all x11 debug messeage i the same both on my working laptop , and nonworking are the same, and ~/.Xauthority get created on the server when i login
The following env variables are set when i log into the server from my laptop ( some var is omitted )
SSH_CLIENT=1.1.1.1 59061 22
SSH_TTY=/dev/pts/1
SSH_AUTH_SOCK=/tmp/ssh-qHuaV5m5QO/agent.32572
LANGUAGE=en_US:en
LOGNAME=xxx
SSH_CONNECTION=1.1.1.1 59061 2.2.2.2 22
DISPLAY=localhost:12.0
The following env variables are set when i log into the server from my debian8 workstation (some var is omitted)
SSH_CLIENT=3.3.3.3 59148 22
SSH_TTY=/dev/pts/1
SSH_AUTH_SOCK=/tmp/ssh-fwG6aBA4he/agent.32763
SSH_CONNECTION=3.3.3.3 59148 2.2.2.2 22
DISPLAY=localhost:12.0
All tests are done with ssh -X serverip , and firewall are disabled.
Also I have attached output from ssh -X -vvvv serverip from my debian8 workstation
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Mar 5, 2016
I am at a loss as to what to do to get Privoxy working. I have tried it using Ice Weasel and Konqueror and end up with the same problem: after I set the configuration in the browser, I cannot access anything on the internet.
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May 3, 2016
I've installed KVM and Webvirtmgr on a new install of Jessie
Code: Select all Linux CPCDEVKVM01 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2 (2016-04-08) x86_64 GNU/Linux
This machine has 16 GB of RAM and a Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz, anyway
when I try to
Code: Select allsudo service libvirt-bin restart
I get:
Code: Select allFailed to restart libvirt-bin.service: Unit libvirt-bin.service failed to load: No such file or directory.
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Jun 16, 2010
I work in a company and we have problems on our server so i decided to investigate.
I found first that we don't have any ftp logs. We use vsftpd and i tried unsuccessfully to configure it to write the logs.
So here i am: - vsftpd doesn't have any logs (no vsftpd.log file in /var/log/)
I added the following lines in the vsftpd.conf :
syslog_enable=YES
log_ftp_protocol=YES
xferlog_enable=YES
vsftpd_log_file=/var/log/vsftpd.log
[Code]....
I also took a look at vsftpd process : it is owned by a user called "nobody" and a user called "www-data" when i upload or download files.
Is it a problem of permission on the log file ?
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Jul 4, 2011
I would appear that I recently installed linux-image-2.6.32-5-amd64. Since then I have noted that my HP media bar up top doesn't work. This means I can't enable/disable wireless. From an lspci output, it still sees the hardware, and it's loaded, however, not functioning. Should I be looking at rolling the kernel back, or work on getting it working via some other means? Any liveCD I've tried doesn't seem to be able to get it going either. So I'm under the assumption here it is the kernel version, and not a hardware problem.
lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c) .....
Also tried this to no avail:
sudo apt-get install rfkill
rmmod iwlagn
rfkill block all
rrfkill unblock all
modprobe iwlagn
rfkill unblock all
ifconfig wlan0 up
SIOCSIFFLAGS: Unknown error 132
rfkill list
2: phy2: Wireless LAN
Soft blocked: no
Hard blocked: yes
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Jul 8, 2011
I try to use the "ping -a" command for getting an audible ping. But there is just silence The command "beep" works fine, so everything should be ok with the speaker (in the konsole).
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Jun 28, 2015
In a hp pavilion 15 Notebook PC with Debian 8.1.After two hours or so wifi stops working. Network-manager does not give any indication of failure but some times a yellow question mark.
rfkill list wifi gives:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
ifconfig gives:
eth0 Link encap:Ethernet HWaddr 8c:dc:d4:7b:c2:0e
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:3994 errors:0 dropped:0 overruns:0 frame:0
TX packets:3661 errors:0 dropped:0 overruns:0 carrier:0
[code]...
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Oct 28, 2015
I have a debian box connected to a windows storage server.
For a number of years I have been using CIFS to connect, and now it seems to have stopped working.
Code: Select all~# mount -t cifs //192.168.97.66/sharefolder/ /localfolder -o rw,file_mode=0666,dir_mode=0777,username=NASuser,password=**** -vvv
mount: fstab path: "/etc/fstab"
mount: mtab path:Â "/etc/mtab"
mount: lock path:Â "/etc/mtab~"
mount: temp path:Â "/etc/mtab.tmp"
mount: UID:Â Â Â Â 0
mount: eUID:Â Â Â Â 0
mount: spec:Â "//192.168.97.66/sharefolder/"
[CODE]
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Nov 12, 2015
I've installed macchanger and choosen the "run on boot" option. But it doesn't work.
Dump of /var/log/macchanger.log:
Code: Select alldisabled in /etc/default/macchanger
disabled in /etc/default/macchanger
disabled in /etc/default/macchanger
disabled in /etc/default/macchanger
disabled in /etc/default/macchanger
[Code] .....
If I change to ENABLE_ON_POST_UP_DOWN=true then I get this log-output after reboot:
Code: Select allIFACE = --all
/usr/bin/macchanger: unrecognized option '--all'
GNU MAC Changer
Usage: macchanger [options] device
[Code] ....
Report bugs to [URL] ....
Guess its some bug about the interface, but how do I change it?
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Apr 17, 2016
I am new to linux and decided to use Debian. I installed it on my laptop and have a few problems.First one is my WIFI.
Laptop type: HP Omen 15
Wifi adapter: Intel Wireless 7260n
rfkill list output:0: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
So wifi is not displaying
Kernel: 3.16.0-4-amd64
Debian version: 8.4
gui: LXDE
URL....
But they see in rfkill list the adapter.How to make this adapter work?I did this with no result:
nano /etc/modprobe.d/blacklist.conf
in file add:
#Fixing a bug that prevents wifi from working on HP Omen
blacklist acer_wmi
I would like to learn more about Linux, but before experimenting I need a working system. The plan for me is to run this as my native machine with vms on top of it with other OS.
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Jul 6, 2010
I don't print much, but tonight needed to print and found that none of the printers were listed in Okular or Openoffice, then when I tried to open Cups Administration http://localhost:631/ I got the error message Connection to Server Refused
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Aug 13, 2010
I just did a regular install of debian lenny on a stand-alone machine. Now I want to add some new mp3-software. Debian doesn't like it if I install as root. A regular gets other negative results:
wlff@debian:~/My_Apps/mpg321-0.2.12-1$ ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... no
checking for gawk... (cached) mawk
checking for gcc... no
checking for cc... no
checking for cc... no
checking for cl... no
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details.
wlff@debian:~/My_Apps/mpg321-0.2.12-1$
I did find the GNU-compiler in /usr/lib/gcc. So what could be wrong with gcc, and what about gawk, cc and cl?
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Dec 8, 2010
The computer networking works fine with a normal static setup, but adding a USB wireless device is not successful. It is my own network so the wpa-ssid and wpa-psk are known to work with Lenny and a previous wireless device.The device is recognized (lsusb) and the driver is confirmed to be in the kernel (lsmod). Here is the iwconfig output:
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
After typing: ifconfig wlan0 192.168.1.144 up I can ping that address, but it is not working. I have just done a fresh install of Sid so that I could get the 2.6.35 kernel which contains the ath9k_htc driver for the USB wireless device that I am using. The firmware is ar9271.fw but my source of that is questionable because it does not seem readily available. I am temporarily using a PCMCIA wired connection which is what I am using to connect to the computer via telnet. (This is just for convenience so as to avoid getting up all the time.) Here is the ifconfig output:
eth0 Link encap:Ethernet HWaddr 00:40:05:07:d9:11
inet addr:192.168.1.122 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::240:5ff:fe07:d911/64 Scope:Link
[code]...
That file works with the previous USB wireless device under Lenny. Am I doing something wrong or is the driver and firmware just not up to snuff yet?
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Feb 14, 2011
I am moving over to debian from ubuntu, and the latest install is to an acer aspire one netbook, the wireless card seems to be working and I can see available networks and even connect to mine (with WPA encryption) via the gnome network manager, however opening a browser or pinging both local and external machines all fail. its as if the OS does not not know to use the card. The wired works fine.
If memory serves the card is identified by lspci as Atheros AR5007.
There is no reference to wlan0 in etc/network/interfaces.
I do not have that system on now and have to leave for work, but I can post any further info from conf files etc as required when i get home tonight... Just thought I'd post a quick description in case I'm missing something obvious...
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Mar 20, 2011
About an hour ago i did an update on my Debian Squeeze. After the update was completed my LAN connection stopped working.. now i have to connect my computer to my router with a usb cable instead with my ethernet cable.. also, on the network connection, on the wired network section it says that the device(ethernet) has not been managed..
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Jun 1, 2011
after a long time I did a little upgrading of the packages...
bind9-host:amd64 (9.7.3.dfsg-1~squeeze1, 9.7.3.dfsg-1~squeeze2), linux-image-2.6.32-5-d64 (2.6.32-31.6.32-34squeeze1), dnsutils:amd64 (9.7.3.dfsg-1~squeeze1, 9.7.3.dfsg-1~squeeze2), linux-headers-2.6.32-5-common:amd64 (2.6.32-31, 2.6.32-34squeeze1),
[code]...
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