League of Professional System Administrators - Networking

LinuxFest 2008 Recap.

mhalligan — Sat, 03 May 2008 19:04:34 -0700

Last weekend we went to LinuxFest NorthWest 2008 in Bellingham, WA. It was a great time, we handed out a bunch of Tee-Shirts, met a lot of good people, and saw some interesting presentations. I even spoke with around half a dozen potential summer interns.

tcpdrop

jm — Thu, 05 Jul 2007 15:14:25 -0700

Short Description:
A Tool to Drop TCP Sessions for the Solaris OS

Home Page:
typo.submonkey.net/pages/tcpdrop-solaris

Release Date:
Mon, 2006-12-04 15:00

Status:
Stable

Long Description:

There are occasions during an administrator's work when it is necessary to forcibly disconnect an established TCP session. However, no easy way exists for an administrator to drop an established TCP session without doing something heavy-handed, such as null routing all traffic from the client, adding an ipfilter rule (which, again, likely blocks more traffic than is strictly necessary), or taking the last resort of killing the associated server-side process.

Ceri Davies ported tcpdrop from the BSD projects, which allows an administrator to easily drop any TCP connection without harmful effects elsewhere.

Asking for Comments: Samba Server Setup Experience Under Fedora Core 6

ant — Wed, 23 May 2007 12:43:29 -0700

Solved -- The box didn't retain my permissiable SELinux environment after a yum update. With a 'sudo setsebool -P samba_enable_home_dirs=1' there was a mighty noise and it started allowing public read-only access to the share.

Someone liked my work (that they help me do) so well, that recently they requested I share the file with everyone on the LAN. I set out to create a publicly readable Samba share for the file. As a user, I issued a 'sudo yum install samba' and soon after started working on the default config file in /etc/samba/smb.conf.

Here's the mix I came up with (which, keep in mind, doesn't work; I could use some help!)

Carnegie Mellon NetReg

vitroth — Wed, 07 Mar 2007 21:18:34 -0800

Short Description:
Enterprise class IP Address, DNS & DHCP management system.

Home Page:
www.net.cmu.edu/netreg

Release Date:
Wed, 2002-01-30 22:00

Status:
Stable

Long Description:

The Carnegie Mellon NetReg package is a scalable and flexible Web-based system for managing networks. It consolidates information about DNS zones, subnets, machine registrations, and DHCP configuration, and provides tools for easy management. The system exports ISC BIND configuration and zones, and can update them via either static zone files or TSIG signed dynamic DNS updates. It also exports ISC DHCP configurations, and has a SOAP API for integration with other systems.

Anthony Spina blogs on tagging

doug — Fri, 09 Feb 2007 11:39:57 -0800

Anthony Spina writes an interesting article on the Splunk blog (here). Using network databases like this can make distributed operations much easier. How do you tag your machines?

NMAP

dklein — Sun, 14 Jan 2007 09:50:04 -0800

Short Description:
Fast enumeration of network services

Home Page:
insecure.org/nmap

Release Date:
Sun, 2007-01-14 10:00

Status:
Active

Long Description:

Nmap is a powerful tool for discovering hosts on a network and enumerating what service they are offering. This can be used to find vulnerable systems, to locate rogue services on your network or simply for a first step in troubleshooting.