Reference
SDH/SONET Hierarchy
Ethernet Frame Format
Ethertype 0x0800: IPv4 Protocols Format
Ethertype 0806: ARP Format
Ethertype 86DD: IPv6 Format
Other data at IANA
Cisco837 ADSL Config
Security
POP3/SMTP/HTTP with stunnel
Want to secure your unencrypted POP3/SMTP/HTTP services? Heres how...
1. Get an SSL certificate, alternatively you can create one but this will throw up a security alertin the client:
Ensure you have stunnel installed.
# cd /etc/stunnel/
# openssl req -new -x509 -nodes -out ssl.pem -keyout ssl.pem -days 10000
Edit stunnel.conf:
cert = /etc/stunnel/ssl.pem
chroot = /etc/stunnel/run
pid = /stunnel.pid
setuid = nobody
setgid = nobody
[pop3s]
accept = 995
connect = 110
[ssmtp]
accept = 465
connect = 25
[https]
accept = 443
connect = 80
# stunnel
Check /var/log/secure (or wherever you syslog to) for errors and confirm with 'ps -C stunnel' that it is running.
Redhat Kernel
make config/oldconfig
make dep
make bzImage
cp System.map /boot/System.map-version
cp arch/i386/boot/bzImage /boot/vmlinuz-version
make modules
make modules_install
mkinitrd /boot/initrd-version.img version