Debian Configuration :: Network Malfunction After Possible Ping Attack

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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Debian Configuration :: Can Ping Public Ip But Cannot Ping Domain Name

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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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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Debian Configuration :: Can't Ping Windows Xp Machine

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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Debian Configuration :: WiFi Connects But Can't Ping - No Internet

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:06 
          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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Debian Configuration :: Ping Fail As User Works With Root?

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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I need to either format those or get into something that will let me access the data partition. Gparted either hangs on boot or doesn't recognise the mouse so I can't reformat the bad partitions. Are there any programs that will ignore the bad partitions and let me access the good ones? Any time I go into a linux distro it either ends up in kernel panic or the mouse doesn't respond. It's hard to explain. With GPARTED, sometimes it hangs at the third line, sometimes it fails at "mounting hard drives", and sometimes it makes it to the GUI but I can't use the mouse. Debian alternates between these as well.

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Sep 27, 2010

i have installed linux debian in my computer but i have aproblem , i have a ping only on my computer itself , not to gateway or other computers on my network .

Ip : 10.0.88.9
Gateway : 10.0.88.1
dns :10.0.88.7

note:when i have installed system i have no internet connection so it is not installed updates

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Security :: NSA On Computer Network Attack & Defense

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Quote:

The 605-page PDF document reads like a listing of the pros and cons for a huge array of defensive and counterintelligence approaches and technologies that an entity might adopt in defending its networks. Of particular interest to me was the section on deception technologies, which discusses the use of honeynet technology to learn more about attackers� methods, as well as the potential legal and privacy aspects of using honeynets. Another section delves into the challenges of attributing the true origin(s) of a computer network attack.

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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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Mar 3, 2011

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Like for example after re-editing my network interface,it was like :

As i did a network restart, i get this error saying :

There is already a pid file /var/run/dhclient.eth0.pid with pid 2802 killed old client process, removed PID file.

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[Code].....

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May 25, 2011

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