RSS Feeds391 results. Narrow Selection By Tag Networking AND
assign specific ttys force pseudo tty network login-->Re TTY Assignments
I don't know of a way to to make sure a particular telnet client always gets the same TTY device. But there are other ways to solve your problem.
| Title | Date | Comments | |||
|---|---|---|---|---|---|
| Misconfigured router causes open SMTP relay | 2012 03 | 2012/03/10 NickBarron | |||
| - The last thing you want is an active mailserver acting as an open relay. Learn how a misconfigured router caused that on an innocent Kerio server. - | |||||
| Auto Edge archive removal script | 2011 09 | ||||
| - The way I wanted Edge to work, was just like the days when we backed up to Tape. We would pull Master backups each night, label the tapes M-F, and take a SAT tape off-site for an extra layer of protection. When Monday rolled around, the new backup would replace the old Monday backup, rinse, lather, repeat. This changed when we upgraded to Edge 3.x, and started using the NAS. Once we had multiple servers with multiple jobs backing up to the same resource, and not having enough free space on the NAS because backups were piling up, I had to resort to manually deleting things (through edgemenu) on the NAS to free up space. This got old rather quickly, as I had to look down the long list of backup jobs, and determine which ones could be deleted. If I missed one day, the NAS would fill up, and backups would fail. - | |||||
| Basic Home Networking, Part 3, File and Printer Sharing | 2011 08 | ||||
| - The point of a computer network is sharing. You might not be sharing much, perhaps even only the Internet connection. If that's the end of it, you don't need much more than part one of this series, which deals with the setup of a basic small network. - | |||||
| A few minor iPad set up problems baffle my neighbor | 2011 08 | 2011/08/28 anonymous | |||
| - A neighbor took advantage of MA's recent tax free weekend and bought an iPad. He'd seen mine and his daughter had shown off hers the last time she had visited, so he had a pretty good idea of why he wanted it. Unfortunately, his initial experience was frustrating. - | |||||
| Basic Home Networking - Part 2, wireless setup | 2011 08 | ||||
| - Often all that needs to be done is to tell your computer that you want to connect to a wireless network. It's not always that easy, but it certainly can be. However, even if it is that easy for you, you might still want to read the rest of this in case you have problems later. You also might want to read it because being "too easy" to get connected could mean that you are running some security risk and need to address that issue. - | |||||
| Basic Home Networking - routers and switches | 2011 08 | 2011/08/16 BigDumbDinosaur | |||
| - Setting up a small office or home network used to be a fairly complicated task. Aside from the technical knowledge needed, there was expensive equipment to buy and specialized tools for wiring. That's all changed - the necessary equipment is cheap and readily available and it's all very easy to configu re. - | |||||
| A non-technical guide to understanding and fixing TCP/IP problems on a network | 2011 08 | 2011/08/14 BigDumbDinosaur | |||
| - The title is a bit incorrect in the .non-technical. claim, because we are dealing with a geekish subject here and I can't avoid being a little "techie". - | |||||
| SCO Unix OSR5 DHCP | 2011 05 | ||||
| - Early SCO Unix had no DHCP capability (it did have DHCP server). That perhaps was somewhat reasonable; these machines were servers and could be expected to have a static IP address. However, as DHCP can do much more than simply provide an IP address, having DHCP would have been advantageous at times. - | |||||
| Mysterious Duplicate IP addresses | 2011 04 | 2011/04/20 TonyLawrence | |||
| - Proxyarp on smart switch causes sudden appearance of duplicate ip addresses: All machines on our 192.168.206.x subnet (mostly Mac's, with Windows servers) got the IP conflict message when they started up in the morning. We do have a linux dhcp server running on that subnet, but it only hands out 2 IP addresses for barcode guns, and those are given the IP based on their MAC address, so each barcode gun always gets the same IP and can move to other buildings without reconfiguring them, as they run in dhcp mode. - | |||||
| A SCO Openserver to Red Hat Linux Conversion | 2011 04 | 2011/04/02 TonyLawrence | |||
| - A detailed history of a SCO to Linux Conversion - including desktop users. - | |||||
| Basic DNS: PTR records and why you care | 2004 07 | 2011/05/02 BigDumbDinosaur | |||
| - A PTR record (sometimes called a "host PTR record") is what lets someone do a "reverse" DNS lookup - that is, they have your IP address and want to know what your host/domain is. - | |||||
| Do you really need a domain controller? | 2007 07 | 2013/02/09 Matt | |||
| - There are advantages to a Microsoft Domain Controller model. Centralized user control, fine grained resource access control: these are often useful and very helpful. - | |||||
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| Map network drive, connect as different user to same Server | 2005 02 | 2011/11/02 anonymous | |||
| - How to map an XP network drive more than once even though XP doesn't want you to do that. - | |||||
| Perl Net::FTP | 2003 09 | 2013/03/13 armin | |||
| - Before the wide spread availability of Perl, I would script ftp transfers with .netrc, ksh scripts and other clumsy ways. None of those methods are fun, flexible or easy. On the other hand, Perl's Net::FTP module is all of that. - | |||||
| Mac Screen sharing is not just for Macs | 2008 01 | 2012/03/22 TonyLawrence | |||
| - Mac Screen Sharing can connect to any VNC host. That's Mac Screen Sharing connecting to a TightVNC server on my wife's Windows XP machine. - | |||||
| How do I test a smtp mail connection? | 1997-2003 | 2010/09/01 alain | |||
| - How do you manually test an SMTP connection? All you need is "telnet" and these instructions. - | |||||
| DUP in ping | 1997-2004 | 2010/09/24 anonymous | |||
| - What causes DUP in ping? Misconfigured or faulty equipment somewhere is likely at fault. - | |||||
| How do I add a default route? | 1997-2003 | ||||
| - How to add a default route on various versions of SCO Unix and have it survive a reboot. - | |||||
| Tightvnc, Chicken of the VNC | 2003 10 | ||||
| - Reviews of TightVNC and Chicken of the VNC. VNC is "Virtual Network Computing" and is a crossplatform method of allowing remote access to desktops (Windows or Unix/Linux, Mac and others)). It is conceptually like using Terminal Services or PcAnywhere etc for Windows but is license free and of course capable of serving Linux/Unix machines also. - | |||||
| VMware Networks, Bridged vs. Nat vs. Host | 2008 12 | 2011/05/19 Firedancerx | |||
| - Understanding VMware networking options. By default, VMware works in "bridged" mode - you use the 192.168.1.4 card by attaching a virtual network device to it. - | |||||
| Routing Basics | 1997 | 2013/04/27 TonyLawrence | |||
| - Network routing basics, understanding TCP/IP routing. So, let's say that 192.168.200.83 is our server, and 192.168.201.35 is a Windows machine. Again, it's a class C netmask (255.255.255.0), so there is going to have to be a router in the network. That router is going to have to have one port on the 192.168.200 network, and one on the 192.168.201 network. - | |||||
| How do I test an imap server? | 1997-2003 | ||||
| - How to test imap from command line. The "abc1" etc at the begining of each command is just a tag you make up. Supposedly it should be unique for each line; I've found you can actually use the same tag over and over again. - | |||||
| Why doesn't ping stop? | 1997-2003 | ||||
| - The default on SCO, Linux, BSD and Mac OSX is to keep running ping until you hit the interrupt key. - | |||||
| Dealing with Duplicate IP addresses | 2009 04 | 2011/11/13 TonyLawrence | |||
| - Duplicate IP's on a network is an interesting problem that has no completely satisfactory solution, especially when malicious intent is involved. Let's leave those intentional conditions for another day; here we'll look at what happens when an IP gets duped accidentally. - | |||||
| Cool Tools: Network View - a network node discovery tool | 2003 08 | 2012/04/13 AlVidetto | |||
| - Identifying addresses and open ports on a network, network node discovery tool. I'm not the only one who maintains this company's network. The operations guy is pretty capable and doesn't mind setting up PCs - he enjoys it. Well, between me and him we had lost track of PC, printers, WAPs, routers, more routers and such like that. We needed a network discovery tool and we found a great one by Michael Welschenbach at http://www.networkview.com/. - | |||||
| CUPS print to file - the hard way! | 2003 03 | ||||
| - Cups print to file - there are easier ways to do this, but I didn't know that when I needed to do it! - | |||||
| Verizon Cell Phone Internet Connections | 2003 06 | 2010/11/11 TonyLawrence | |||
| - Making internet connections with cell phone. I then verified with Verizon that there is no additional costs for using the "Express Network" which claims speeds up to 144k. I usually average between 20-40k, which really blows away my normal dial-up connection at home, since we still do not have any broadband options in my area. During normal "peak" usage, the time spent using the data is billed against my normal minutes. I have unlimitted night and weekend usage, so I could be connected to the network all weekend without additional charges. That's when I plan on downloading O/S patch upgrades. - | |||||
| Log Serial Port Data to a Specified Logfile | 2002 09 | 2013/03/29 TonyLawrence | |||
| - I wrote this script to capture log data from our T1 routers for debugging purposes. - | |||||
| RTL8111/8168B PCI Express Gigabit Ethernet Failure | 2008 12 | 2011/10/16 anonymous | |||
| - Forcing driver with Realtek RTL8111 - an "lspci -vv" revealed that things were not right.. - | |||||
| VPN's and other remote access | 2001 04 | 2011/05/09 TonyLawrence | |||
| - VPN Basics. A VPN is a Virtual Private Network. The concept is that you are using public or other shared lines (generally the Internet) to connect machines, but that all packets are encrypted (so your connections are "private"). - | |||||
| Changing System Name | 2000 09 | 2010/12/07 TonyLawrence | |||
| - Jeff's article is more about other things you MIGHT have to change AFTER you change the ip address - | |||||
| Slow Firefox DNS Mac OS X Leopard | 2007 12 | 2012/05/08 ElizabethA | |||
| - Firefox unable to resolve google sites after waking from sleep. Flushing DNS cache seems to fix it. - | |||||
| Can't connect to Internet | 2006 04 | 2011/02/01 TonyLawrence | |||
| - Causes of lost internet connectivity, unable to connect to internet, troubleshooting advice. If Windows, is it really that you can't access the Internet or only that Internet Explorer cannot? Microsoft's IE is a fragile and rather brain-dead thing, easily confused and easily broken. - | |||||
| How to setup resolv.conf for DNS configuration | 1997-2003 | 2010/05/24 alexB | |||
| - Reverse lookups (lookup name from ip) happen for every attempted connection. Edit the resolver file to get proper behavior and quicker connections. For Linux,that's /etc/host.conf; most other Unixes use /etc/resolv.conf - | |||||
| Xinetd | 2003 07 | 2010/10/29 SalvoLtWorfTomaselli | |||
| - Xinetd is a replacement for inetd, which was the original Unix super-daemon used to start network services on demand. The reason for inetd goes back to days of low memory and poor memory management: you didn't want to keep a service running in memory if it was infrequently used. - | |||||
| What is netcat and how do I use it? | 2002 09 | ||||
| - Using direct port printing on SCO Unix with Kevin Smith's 'netcat' for SCO. Note that Linux can do this in CUPS - this is only for old SCO Unix. - | |||||
| Cell Phone Internet Connections | 2003 06 | ||||
| - How to use your cell phone as Internet access point. You can get text messaging with almost any cell phone nowadays, and it's no great trick to forward email to that. The problem is that it's too hard to read that way: long messages get broken up, the cellphone doesn't have a great keyboard, and it just isn't worth the trouble. - | |||||
| How can I restrict who can login with ssh? | 1997-2003 | 2010/06/27 anonymous | |||
| - There's no reason to allow every user access by ssh. You can restrict ssh logins to a specific set of users by an entry in the config file. - | |||||
| Printing to a remote printer with a dynamic address | 2003 06 | ||||
| - You have a PC at home and you make some sort of connection over the internet to your server, but your application needs to print to your PC. - | |||||
| How can I tell what process has a network port in use? | 1997-2003 | ||||
| - How can I tell what process has a network port inuse? - | |||||
| Understanding IPTABLES | 2002 11 | 2012/11/29 BigDumbDinosaur | |||
| - Packet filtering is something I've always hard a hard time getting my head around. Not the basics; that's easy enough. It's just the incredible level of detail, the difficulty of keeping it all in your head at once. - | |||||
| Advanced TCP | 1998 | ||||
| - Advanced TCP/IP (Understanding TCP/IP). I mentioned earlier that certain network numbers are "special", and that they would be bad choices. - | |||||
| Bonjour Discovery | 2007 11 | ||||
| - Bonjour finds a web server on my printer. Bonjour can find other interesting things and can be used for good or evil. - | |||||
| Networks 101 | 1998 03 | ||||
| - There are a few fundamental ideas about TCP/IP networks that people seem to get confused about. This article might help. - | |||||
| Understanding CIDR | 1998 11 | 2011/08/23 NickBarron | |||
| - I've explained that the netmask shows the bits that are the network part of the address, and that changing anything puts you on a different network. - | |||||
| What can I check if ping doesn't work at all? | 1997-2003 | ||||
| - Basic troubleshooting for ping. Start by a ping by ip address rather than name - if that works, your problem is DNS, not ping. - | |||||
| Linksys RV042 VPN | 2008 11 | ||||
| - I'm a cheaprouter and you are goig to have an unhappy day if I have anything to say about it! - | |||||
| SquidGuard | 2001 09 | ||||
| - squidGuard works with Squid to block access to sites by domain, ip address or even keywords. - | |||||
| Telnet/FTP is very slow to connect | 1997-2003 | 2013/01/27 anonymous | |||
| - Slow telnet or ftp connections are often caused by the server wanting to do a reverse DNS lookup to find out who is connecting - | |||||
| Network Printer Port Numbers | 2000 09 | ||||
| - Port numbers for various network print servers. SUMMARY: Some users may want to print through a router or a firewall and may need to allow access to these destination ports through those devices. - | |||||
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| Fortinet Firewall Transparent Mode | 2007 04 | ||||
| - Using Fortinet firewall in transparent mode to pass through external IP to an existing router. - | |||||
| SSH | 2001 05 | ||||
| - Standard Unix tools like telnet and ftp are not encrypted- everything you type, including your precious passwords, travels in packets that can at least potentially be seen by every machine they pass by or through. - | |||||
| Fortinet Firewall Virtual IP's | 2007 04 | ||||
| - Using Fortinet firewall virtual ip's to forward services to intrnal machines. - | |||||
| I don't understand all this half/full duplex negotiation stuff | 1997-2003 | ||||
| - Here's the basic problem. 10/100 capable network devices have 5 possible duplex modes: - | |||||
| A gentle routing tutorial | 2009 09 | ||||
| - The Internet is held together by the layer III of the TCP/IP protocol suite. - | |||||
| ProFTPd, wu-ftpd, and general ftp security | 2004 12 | ||||
| - FTP in general has a long and sad history of security problems. If you need to run an ftp server, you need to keep careful track of vulnerabilites and exploits that may make for a very unhappy da - | |||||
| Unix passwd to LDAP Script | 2000 01 | ||||
| - This is a simple program that reads the Unix /etc/passwd and updates a LDAP server. See LDAP Basics for an introduction to LDAP. - | |||||
| Newbie guide for the net install of SuSe 9.0 | 2004 01 | ||||
| - Since SuSe doesn't offer free iso download versions of SuSe, I decided to write this guide on how to do an net install (ftp install). - | |||||
| Network Wiring Diagram | 1998 | ||||
| - Color coded RJ-45 Wiring Charts for RJ45 connection in 110 order and for RJ45 connection in RJ pin order. - | |||||
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