Publicado en Español

Como hacer viñetas de politicos en debian

Hoy me he encontrado un programa super sencillo para crear viñetas, a uno que las dotes artisticas son basicas, el poner monigotes ya creados es una pasada.  Por defecto te vienen monigotes para utilizar, en la parte de souht park vienen creados el rajoy ,el ZP la espe y alberto. Super chulo. En 5 minutos tienes la viñeta.

Publicado en English

unable to change config flash write error OpenWrt

Just in case you hit a problem if, you are usin 10.03, the router shutdown by an upgrade, power off, whatever… your partition is read only, and you are not able to modify anything on the router. Login on the console and type dmesg. If complains about

Write of 186 bytes at 0x0015a680 failed. returned -30, retlen 0

Just type:
mtd unlock rootfs_data

#7298 (Cannot edit files in /etc/config due to flash write error) – OpenWrt.

Publicado en Español

Monitor command line output from openwrt backfire using snmp

I have been using snmp to monitor Input and Output traffict from my router base on openwrt . but I want to know if if my users have a virus spamer or they use P2P on my network?, how do you find out over the time?. I can run this command any time to find out how many connections there is on the router:
root@OpenWrt:/jffs/etc# cat /proc/net/ip_conntrack | wc -l
1

So far so good, but i want to have historical data that can give me an idea of when the connections go up or down. Here comes the power of SNMP. First we need iptables-snmp – An snmpd plugin to access iptables rules:

opkg install iptables-snmp

Now we need to created the executable, I put files under /etc/snmp but it is a matter of taste :
root@OpenWrt:/etc/snmp# cat conntrack-count

#!/bin/sh
exit `cat /proc/net/ip_conntrack | wc -l`

Now this needs to be called from the snmpd daemon. So I added on the configuration file:
/etc/config/snmpd:

config exec conntrack_count
option execname conntrack_count
option miboid 1.3.6.1.3.19811018.30
option prog ‘/etc/snmp/conntrack-count’

Reload the snmp daemon /etc/init.d/snmpd reload (you did install it did nt you? opkg install snmpd). So now if you call 1.3.6.1.3.19811018.30 from a snmp client, you can see the number of connections, I use MRTG to create the graphic.

Title[router]: ip_conntrack
Target[router]: 1.3.6.1.3.19811018.30.100.1&1.3.6.1.3.19811018.30.100.1:public@your.ip:
MaxBytes[router]: 100

Here is the output:

Before you create an exec you maybe check a ready to go snmp variables in this page: SNMP OIDs for OpenWrt and here 46 SNMP SMIv1 and v2 MIBs ( 10 SMIv1, 36 SMIv2 ) for Linux