Linux TCP/IP, GreenIT and more…
On June 8, 2011 was world IPv6 day and I shared some VPS boxes. Only one guy wants Ubuntu 11.04 – no problem he get it.
I was painfully remembered that Ubuntu.com has still some problems with AAAA record for security.ubuntu.com… They have no records:) Continue reading ‘Ubuntu ipv6 fail’
Manual Allocation: The administrator assigns a pre-allocated IP address to the client and DHCP only communicates the IP address to the device.
Automatic Allocation: DHCP automatically assigns a static IP address permanently to a device, selecting it from a pool of available addresses. There is no lease and the address is permanently assigned to a device.
Dynamic Allocation: DHCP automatically dynamically assigns, or leases, an IP address from a pool of addresses for a limited period of time chosen by the server, or until the client tells the DHCP server that it no longer needs the address.
1 2 3 4 5 6 7 | R1(config)# ip dhcp exclude-address 192.168.10.1 192.168.10.9 R1(config)# ip dhcp exclude-address 192.168.10.254 R1(config)# ip dhcp pool LAN-POOL-1 R1(dhcp-config)# network 192.168.10.0 255.255.255.0 R1(dhcp-config)# default router 192.168.10.1 R1(dhcp-config)# domain-name span.com R1(dhcp-config)# end |
Configure DHCP address:
1 2 3 | Eagle(config)# interface fa0/0 Eagle(config-if)# ip address dhcp Eagle(config-if)# no shut |
Configure DHCP relay:
1 2 3 4 | R1# config t R1(config)# interface Fa0/0 R1(config-if)# ip helper-address 192.168.11.5 R1(config-if)# end |
Configure Static NAT
1 | R2(config)#ip nat inside source static 192.168.20.254 209.165.202.131 |
Configure Dynamic NAT Overload
1 2 3 4 5 6 7 8 9 10 | R2(config)#ip nat pool R2POOL 209.165.202.128 209.165.202.130 netmask 255.255.255.252 R2(config)#ip nat inside source list R2NAT pool R2POOL overload R2(config)#interface Serial 0/1/0 R2(config-if)#ip nat outside R2(config)#interface fastEthernet 0/0 R2(config-if)#ip nat inside # optional ISP(config)#ip route 209.165.202.128 255.255.255.224 serial0/0/0 |
IPV6 Dual Stack Configuration:
1 2 3 4 5 | conf t pv6 unicast-routing interface ethernet0 ip address 192.168.99.1 255.255.255.0 ipv6 address 2001:470:1f0b:1514::7/64 |
IPV6 Routing:
1 2 3 4 5 | Router(config)# ipv6 unicast-routing Router(config-if)# ipv6 address ipv6prefix/prefix-length eui-64 DNS Resolver: ip name-server 2001:470:1f0b:1514::1 |
The standard ftp command/client does not support IPv6 resolution.
A very powerful IPv6 ftp client alternative is lftp.
1 2 3 | id@acer:~$ lftp ipv6.idrobot.net lftp ipv6.idrobot.net:~> dir -rw-r--r-- 1 ftp ftp 0 Aug 26 17:28 test.txt |
And of course Firefox does FTP over IPv6:
ftp://ipv6.idrobot.net OR ftp://[2a01:4f8:131:51e2::10]
In this how to I describe the basically configuration and administration of Postfix on Debian Lenny.
Current I’m using Postfix version 2.5.5
This tutorial should working with older and newer versions.
1 2 | postconf -d | grep "mail_version =" | cut -d" " -f 3 2.5.5 |
You can find the postfix main configuration file under “/etc/postfix”
Let see what wee need to configure a working Internet Mail-Server
1 | postfix ~ # vim /etc/postfix/main.cf |
My example configuration:
1 2 3 4 5 6 7 8 9 10 11 12 13 | myhostname = ipv6.postfix.idrobot.net alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = ipv6.postfix.idrobot.net, localhost.localdomain, localhost mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 smtp_bind_address6 = 2a01:4f8:101:265::37 mailbox_command = mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all home_mailbox = Maildir/ bounce_template_file = /etc/postfix/bounce.cf |
If you want to relay your mails to another mail-server you can use the relayhost option:
Edit main.cf, and add this line:
1 | relayhost = ipv6.mx.idrobot.net |
Some administration commands:
Show running config:
1 | postconf -n |
Show the default postfix config instead of running one:
1 | postconf -d |
Show message content:
1 | postcat -q 7FB942082 |
Delete all mail in queue:
1 | postsuper -d ALL |
Schedule immediate delivery:
1 | postqueue -i 7FB942082 |
Flush the queue:
1 | postqueue -f |
1. Launch the X-Terminal application
2. Type in the command: “sudo gainroot”
3. Type in “apt-get install kernel-power-flasher” to launch the request to install the IPv6-enabled kernel available at Extras-Testing repository
4. Accept ll confirmations
5. After finishing the download, the new kernel will be flashed automatically to your N900 device. Now turn of the device and then turn on the device to reboot.
Now you are able to use ipv6 module
To add very simple ipv6 address install “IPROUTE” to use “ip” command.
1 | ip -6 a a 2001:470:1f0b:1514::100/64 dev wlan0 |