Protected: ehem ehem

This post is password protected. To view it please enter your password below:

Password:

Shell script patch sys openbsd and build new kernel

#!/bin/sh
cd /usr/src

#wget –passive-ftp ftp://ftp.openbsd.org/pub/OpenBSD/`uname -r`/sys.tar.gz

#tar zxvf sys.tar.gz

#wget –passive-ftp ftp://ftp.openbsd.org/pub/OpenBSD/patches/`uname -r`/common/*

echo “run patch -p0 < *.patch”

ls *.patch >> file.patch

for i in `cat file.patch`
do
patch -p0 < $i
done

cd /usr/src/sys/arch/`arch -s`/conf
config GENERIC && cd ../compile/GENERIC
make depend && make && sudo make install
reboot

dns-cache-poisoning-test vul or not

Use this command

$ dig +short @{name-server-ip} porttest.dns-oarc.net txt
$ dig +short @ns1.example.com porttest.dns-oarc.net txt
$ dig +short @208.67.222.222 porttest.dns-oarc.net txt

Output:
z.y.x.w.v.u.t.s.r.q.p.o.n.m.l.k.j.i.h.g.f.e.d.c.b.a.pt.dns-oarc.net.
“208.67.222.222 is GOOD: 26 queries in 0.1 seconds from 26 ports with std dev 17746.18″

Another test,
$ dig +short @125.22.47.125 porttest.dns-oarc.net txt

Output:

z.y.x.w.v.u.t.s.r.q.p.o.n.m.l.k.j.i.h.g.f.e.d.c.b.a.pt.dns-oarc.net.
“125.22.47.139 is POOR: 42 queries in 8.4 seconds from 1 ports with std dev 0.00″

Network Layer — IP — Internet Protocol

The key to all this is the following relations of decimal versus binary:

Decimal Binary How the binary is built
0 00000000
128 10000000 (128)
192 11000000 (128 + 64)
224 11100000 (128 + 64 + 32)
240 11110000 (128 + 64 + 32 + 16)
248 11111000 (128 + 64 + 32 + 16 + 8)
252 11111100 (128 + 64 + 32 + 16 + 8 + 4)
254 11111110 (128 + 64 + 32 + 16 + 8 + 4 + 2)
255 11111111 (128 + 64 + 32 + 16 + 8 + 4 + 2 + 1)

Given that, we can build the following table:

Useful only for| Useful for subnets | Useful for subnets | Useful for subnets
CIDR blocks | of /8, or for CIDR | of /8 or /16, or for | of any networks
of any networks| blocks of /16 and | CIDR blocks of /24 |
| /24 networks | networks |
| | |
0.0.0.0 /0 | 255.0.0.0 /8 | 255.255.0.0 /16 | 255.255.255.0 /24
128.0.0.0 /1 | 255.128.0.0 /9 | 255.255.128.0 /17 | 255.255.255.128 /25
192.0.0.0 /2 | 255.192.0.0 /10 | 255.255.192.0 /18 | 255.255.255.192 /26
224.0.0.0 /3 | 255.224.0.0 /11 | 255.255.224.0 /19 | 255.255.255.224 /27
240.0.0.0 /4 | 255.240.0.0 /12 | 255.255.240.0 /20 | 255.255.255.240 /28
248.0.0.0 /5 | 255.248.0.0 /13 | 255.255.248.0 /21 | 255.255.255.248 /29
252.0.0.0 /6 | 255.252.0.0 /14 | 255.255.252.0 /22 | 255.255.255.252 /30
254.0.0.0 /7 | 255.254.0.0 /15 | 255.255.254.0 /23 | 255.255.255.254 /31