Task: Find full or half duplex speed
You can use dmesg command to find out your duplex mode:
# dmesg | grep -i duplex
Output:
eth0: link up, 100Mbps, full-duplex, lpa 0×45E1
ethtool command
Uss ethtool to display or change ethernet card settings. To display duplex speed, enter:
# ethtool eth1
Output:
Settings for eth1:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 10Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: g
Current message level: 0×00000007 (7)
Link detected: yes
mii-tool …
Block brute force attacks with iptables
Because iptables comes standard with every Linux distribution we’ll skip right to setting up the specific firewall rules we need. In depth configuring of iptables takes a bit of understanding and is not within the scope of this article, but let’s take a look at these two statements:
sudo iptables -A INPUT -i eth0 -p tcp –dport 22 -m state –state NEW -m recent –set –name SSH
sudo iptables -A INPUT -i eth0 -p tcp –dport 22 …
Before you can install ports, you must first obtain the Ports Collection–which is essentially a set of Makefiles, patches, and description files placed in /usr/ports.
When installing your FreeBSD system, sysinstall asked if you would like to install the Ports Collection. If you chose no, you can follow these instructions to obtain the ports collection:
CVSup Method
This is a quick method for getting and keeping your copy of the Ports Collection up to date using CVSup protocol. If you want to learn …
To begin, change to the directory for the port you want to install:
# cd /usr/ports/sysutils/lsof
Once inside the lsof directory, you will see the port skeleton. The next step is to compile, or “build”, the port. This is done by simply typing make at the prompt. Once you have done so, you should see something like this:
# make
>> lsof_4.57D.freebsd.tar.gz doesn’t seem to exist in /usr/ports/distfiles/.
>> Attempting to fetch from ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/.
===> Extracting for lsof-4.57
…
[extraction output snipped]
…
>> Checksum OK for lsof_4.57D.freebsd.tar.gz.
===> …
