When I restart my Pirelli modem it allways disconnects all TCP connections! After the connection table of the Pirelli is flushed (by rebooting) it sends a RST for the next packet of any TCP connection.Why doesn’t it simply forward this packet. Client and servers don’t care if a router on the way is rebooting. Pirelli […]
Pirelli Modem does allways NAT Read More »
Problem: Pirelli modem is not transparently routing traffic for tcp port 7070 and 554. I’m using a Pirelly VDSL modem at home in pure routing mode (no NAT, no QoS). When starting a TCP connection to port 7070 (or 554), the Pirelli modem answers the TCP SYN with SYNACK, then it tries to connect the
Pirelli doesn’t forward port 7070 correctly Read More »
Problem: If you want to add water marks onto a pdf document, you have to merge two pdf files into one pdf file. Solution: On Linux there is a tool called pdftk (PDF Toolkit), which can do this. pdftk <letter.pdf> background <background.pdf> output <letter-with-background.pdf>
Howto: Merge two PDF Files onto One Page Read More »
I don’t burn CDs often, but when I do I still look for “cdrecord”, which doesn’t exist on debian anymore. Debian forked the source and renamed it to wodim, because of a license dispute between the Debian maintainers and cdrtools author Jörg Schilling.
cdrecord is called wodim now Read More »
Problem: Windows 7 clients wait 5 seconds to send simple HTTP requests to a web server behind a cisco CSS content switch. But there is no delay when the client connects directly to a web server behind the CSS. Description: I found one difference between CSS and non-CSS connects: the TCP WSCALE option. When the
WScale and Cisco Content Switch CSS. Read More »
If you like to restrict access to a directory on your Apache web server to users from a fixed IP range without password, and the rest of the world with password authentication the httpd.conf section can look like this for Apache-2.2: For apache-2.4 the syntax has changed to:
Apache Authentication by IP and Password at the Same Time Read More »
Problem: A Cisco IP phone (in my case 7970G) does not sync with an NTP server. The phone sends an NTP request, receives an NTP response, but does not set its date and time. Solution: It’s a known bug of Cisco’s IP phone software releases 8.3(3) or higher according to Cisco bug id: CSCso40588. Cisco
Cisco IP Phone and NTP Read More »
Challenge: You have a linux based firewall, which should forward all internal and external traffic of its connected clients through a VPN tunnel, and at the same time the traffic from the firewall itself should not go through the tunnel (e.g. the tunnel connection packets). Solution: There are lots of howtos for this probably. Here
Multiple Routing Tables with IPTables Read More »
I just read that MircoSoft announced a “new” software to control two WindowsPCs with one keyboard and mouse. It might be new to MircoSoft but a software for this exists since about 1998. When I had both Linux and Windows on my desktop some years ago I used x2vnc for this. Read on: http://fredrik.hubbe.net/x2vnc.html
One Mouse and Keyboard for Two Computers Read More »
I use Logitech Squeezeboxes at home for my music library, Internet radio, and podcasts. The server is running on my Linux server, and the clients are Squeezebox Boom and Squeezebox Duet. If you like to stream to your desktop PC, you can use several software squeezebox clients, but there is also a simple way to
Squeezebox Remote Streaming Read More »