ip crossover: send packets on eth0 out and receive them via eth1  
Wednesday, April 15, 2009, 14:32 - Network
Posted by Administrator
For testing my intellon driver on one pc i need to send packets on eth0 (intellon usb) out and receive them via eth1 (intellon ethernet).

The only solution i found was a not anymore supported module for netfilter from Rusty Russell.

I tried to fix the compiler errors/warnings and finally it worked.

Usage:

ifconfig eth0 192.168.1.1
ifconfig eth1 192.168.2.1
arp -s 192.168.1.2 <hardware address of eth1> -i eth0
arp -s 192.168.2.2 <hardware address of eth0> -i eth1
modprobe ip_crossover dev1=eth0 dev2=eth1

Then doing ping 192.168.1.2, ICMP ping goes out eth0 and comes back in eth1.

ip_crossover.tar.bz2


for testing packets with differenz sizes i did:

for i in $(seq 0 1472); do ping -q -c1 -s$i 192.168.2.2 >/dev/null || echo fail $i; done

for i in $(seq 0 1472); do ping -q -c1 -s$i 192.168.1.2 >/dev/null || echo fail $i; done


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Intellon int51x1 PLC usb net driver for devolo dlan duo 
Wednesday, April 15, 2009, 09:34 - Network, Patches
Posted by Administrator
Here is how i made the patch for inclusion:

git config --global user.name "Peter Holik"
git config --global user.email "peter AT holik.at"

check kernel out with git

git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

first i had to export usbnet_get_ethernet_addr from usbnet.c
and to fix cdc_ether.c

git commit -am "export get_ethernet_addr from cdc.ether.c in usbnet"

then copy my new driver int51x1.c to /usr/src/linux-2.6/drivers/net/usb/ and modify /usr/src/linux-2.6/drivers/net/usb/Kconfig and /usr/src/linux-2.6/drivers/net/usb/Makefile

git add /usr/src/linux-2.6/drivers/net/usb/int51x1.c

git commit -am "usb driver for intellon int51x1 based PLC like devolo dlan duo"

git format-patch -s origin/master

Then mail the created file to linux kernel mailinglist:

cat 0001-export-usbnet_get_ethernet_addr-from-usbnet-and-fixe.patch | \
mail linux-kernel@vger.kernel.org

cat 0002-usb-driver-for-intellon-int51x1-based-PLC-like-devol.patch | \
mail linux-kernel@vger.kernel.org

Many thanks to the guys at linux-kernel@vger.kernel.org for suggestions and improvements.

Undo last commit with git reset --soft HEAD^

My driver will be part of linux kernel 2.6.31

git quick reference

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block ssh brute force attacs / prevent synflooding 
Tuesday, October 28, 2008, 09:49 - Network, Security
Posted by Administrator
With iptables module recent you can limit the count of tcp connection attempts. In my case i allow only 3 ssh connection attempts per minute. This stops script kiddies doing ssh brute force attacs.
iptables -N synflood
iptables -A synflood -p tcp --dport ssh -m recent --set --name SSH
iptables -A synflood -p tcp --dport ssh -m recent --update \
                     --seconds 60 --hitcount 4 --name SSH -j DROP

iptables -A INPUT -p tcp -m state --state NEW -j synflood
iptables -A FORWARD -i $OUT -p tcp -m state --state NEW -j synflood


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fast sftp 
Friday, September 5, 2008, 12:15 - Network, Security
Posted by Administrator
sftp -o Ciphers=blowfish-cbc USER@HOST

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find PCs in a network 
Thursday, June 5, 2008, 10:51 - Network, Programming
Posted by Administrator
for i in $(seq 2 254); do ping -c 1 192.168.0.$i | grep -q rtt && echo "found 192.168.0.$i"; done

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