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Send traffic from one serial port out to another serial port Hi, We've got a system where we need to occasionally in effect link two serial ports together on our system which is running linux. Scenario (/dev/ttyS1) <radio> --- rs232 -- [linux system] --- rs232 -- <terminal> (/dev/ttyS0) Normally the terminal talks to the linux system which sends traffic if nee... 11 Mar 2010 07:48
Network traffic monitor - tip from expert Which network traffic monitor do you use ? I don't feel like downloading blindly from the internet. Thanks. ... 11 Mar 2010 07:48
Determining the presence of wireshark Hi, How to determine the presence of wireshark in a network ? Are there any specific packet types exchanged while it is present in the network so that it can be used to determine its presence in the network . Any tool to identify its presence in either Windows or Linux ? Any ideas ? Thx in advans, Karthik Bala... 10 Mar 2010 09:40
how to inform pppd Session-Timeout value using radius Hi, I am trying to set up a vpn service using radius+mysql+pptpd+pppd, so far everything is right that user in table radcheck can login using the config'ed password. Now I want to control the behavior of a ppp connection from the server side, e.g. forcing disconnecting a user. pptpd is not a decent NAS that... 9 Mar 2010 01:18
what is UUID of a network card Hello, I had noticed that there is an entry called UUID in the network configuration file in newer Fedora distros; this UUID entry did not exists on older distros. My question is: for what is this entry? what will happen if I will comment it? I am talking about /etc/sysconfig/network-scripts/ifcfg-eth0 configu... 7 Mar 2010 16:15
find and autofs I have a few cron jobs which start jobs like 'find / ....' and these jobs, in cooperation with autofs tries to mount all of the hosts in my /etc/hosts file as //net/somehost.fdqn.blah How can I constrain find to not try to search the network? My best guess is to constrain it by filesystem type. I thought find ... 9 Mar 2010 12:19
iptables rule Hi, I want a service on a server in my DMZ to be available via the standard port for internal machines but on a non-standard port to the outside. I have on my firewall machine $IPTABLES -t nat -A PREROUTING -d $SERVERIP -p tcp --dport $EXTPORT -j DNAT --to $SERVERIP:$INTPORT and this seems to work to make the... 6 Mar 2010 19:34
Timer for every frame ? Hi, In the case of error control, the positive/negative acks play a great role to help the sender in deciding on the retransmission. It seems that the sender has to maintain a timer for every frame in Data Link Layer. But, wouldn't maintaining a timer for every frame a very high overload in high speed connection... 4 Mar 2010 21:23
ANNOUNCE: Exscript 2.0 Introduction ------------- Exscript is a Python module and template processor for automating Telnet or SSH sessions. Exscript supports a wide range of features, such as parallelization, AAA authentication methods, TACACS, and a very simple template language. Please refer to the project page for updated documentat... 4 Mar 2010 15:47
sudo with redirection [was: Trouble with X11 over SSH on Mandriva 2010.0] Chris Davies <chris-usenet(a)roaima.co.uk> wrote: Kevin the Drummer <nobody(a)cosgroves.us> wrote: Say, I've been wanting to know how to get sudo to work with redirection. By that I mean that I need root permission to write into the redirection target. Consider: some_command > some_file ... 3 Mar 2010 16:24
bridging a hardware nic and a tap for virtualization #!/bin/bash brctl addbr br0 tunctl -u kvm -t qtap0 brctl addif br0 ifconfig qtap0 promisc arp 0.0.0.0 up ifconfig eth1 promisc arp 0.0.0.0 up brctl addif br0 eth1 ifconfig br0 192.168.1.220/24 route add default gw 192.168.1.254 brctl addif br0 qtap0 brctl show /usr/bin/vde_switch --tap qtap0 --dae... 3 Mar 2010 07:20
DNS questions We are having some problems with our Linux DNS computer on a windows network. Most sites we can get to but others we cannot. The site comes up not found. One of the simple questions I have is how can I know when I change the dns address if its working. In other words, Its my understading that I simply need ... 7 Mar 2010 07:24
Bridging ethernet interface through wlan interface in linux I am wondering how to bridge eth iface over wlan iface, associated to a managed-mode AP without mangling source MAC. It's my understanding that a managed mode ap will reject frames with a source mac other than one who is associated, hence all downstream clients from the bridge won't get their traffic through succ... 1 Mar 2010 15:15
IPSec VPN with 2 * Zyxel Zywall 2 Plus Hello, * I am currently trying to set up a VPN tunnel with two Zyxels. It looks simple enough, and it works-- sometimes. And sometimes I see security associations between the firewalls, but no traffic is passing through the tunnel. Or I see all LEDs blinking, suggesting that a lot of traffic is going on, but not... 1 Mar 2010 14:07
Bind to port 22 on 0.0.0.0 failed: Address already in use Pascal Hambourg <boite-a-spam(a)plouf.fr.eu.org> writes: Probably the IPv6 socket listening on :: (short form of 0:0:0:0:0:0:0:0, the IPv6 unspecified address), that sshd opened just before. If the socket was opened without the V6ONLY option or if sysctl net.ipv6.bindv6only=0 (kernel default), such a socket a... 1 Mar 2010 08:03
LAN - IPX/SPX and TCP/IP Hi, I understand that IPX and SPX both provide connection services similar to TCP/IP. Here, IPX is similar to IP and SPX is similar to TCP and hence eager to know about this. 1. How does the performance of IPX/SPX exceed that of TCP in LAN and what are the main design factors that enabled IPX/SPX to perform b... 2 Mar 2010 12:21 |