ss – anothre utility to investigate sockets.

2013-04-11 1 min read Fedora Linux
ss is : ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state informationsthan other tools. This comes in iproute package in Fedora. So, to install this you would need to install “iproute” if not installed already. sudo yum install iproute Now, once you have done that you can look at the man page to check what all you can see with ss. Continue reading

dnsmasq not starting from NetworkManager with SELinux enabled.

2013-03-16 1 min read Fedora Learning Linux
OpenWrt – Dnsmasq (Photo credit: magicfab) Some time back I posted on dnsmasq starting from Network Manager and how to setup dnsmasq. Now, couple of days back , I setup dnsmasq in NetworkManager but was astonished to see that there was no dnsmasq running. I checked with dig and saw that there was no response from localhost for dns queries. Checked “ps -eaf|grep dns” and found that there was no dnsmasq running. Continue reading

slow ssh connection

2013-02-26 1 min read Linux
If you are experiencing slow ssh connections, then possibly your system is trying to do reverse lookup of the IP address. If that is the case, then you can add the below to “hosts” line in /etc/nsswitch.conf file. ‘[NOTFOUND=return]’ The other cause for slow connections can be GSSAPI authentication. If that is the case, then the simplest solution is to add the following in your “~/.ssh/config” file: GSSAPIAuthentication no Related articles ssh reverse tunning. Continue reading

ssh reverse tunning..

2013-02-14 1 min read Fedora Learning Linux
If you want to access some local resources like the release website from the remote server when you are connecting to the remoter server using ssh over VPN, then possibly reverse ssh tunnelling is the best option. So, basically when you are connecting to the remote server, you tell the server your intent to do so and which local resource you want to connect to and on which port.So, here I want to connnet to google. Continue reading

dnstop – top like utility for Fedora and other *nix

2013-01-16 1 min read Fedora
For installation : sudo yum install dnstop And now some description: dnstop is a libpcap application (ala tcpdump) that displays various tables of DNS traffic on your network. dnstop supports both IPv4 and IPv6 addresses. To help find especially undesirable DNS queries, dnstop provides a number of filters. dnstop can either read packets from the live capture device, or from a tcpdump savefile. Couple of days back, I realized there was too much network activity on my Continue reading

snmpd -verify if the mibs are loaded.

2012-09-10 1 min read Fedora Linux
If you are setting up the snmpd server and have added your own mibs and do not really know if the mibs are loaded or not then simply go to the directory: /var/lib/net-snmp/mib-indexes This can save you a lot of time, if you are not getting results with snmpwalk. You can even use snmpwalk as : snmpwalk -v -c Well, these little things can save you a lot of time 🙂 Continue reading

ss – utility to investigate sockets.

2011-09-07 1 min read Fedora Linux
Sometimes, you find some interesting application/command by accident, and that is just what happened a few days back. Well, I was doing a ssh and as usual made my share of mistake in typing and missed the “h” from the ssh command and saw a list of options instead of my prompt on remote server. Now, that set me thinking and fond that its a very interesting command that comes with iproute on Fedoara, so if you want this command, then install iproute like this Continue reading
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