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To know the IP address you use to go out on the Internet, you can use a site like http://www.whatismyip.com
In text mode with no Web browser, it’s a bit more complicated. You can use the following command:
wget --user-agent="Mozilla/5.0" -O - http://www.whatismyip.com 2>/dev/null | grep -o "Your IP Address Is: [0-9.]*"
We have to simulate a real browser, or the site refuses us.
UPDATE 14/01/2010
To find your external IP address, an even more elegant way:
dig +short myip.opendns.com @resolver1.opendns.com
UPDATE 06/05/2010
The best way:
curl icanhazip.com
http://www.commandlinefu.com/commands/view/2966/return-external-ip
When printing an image under Gnome (Eye of Gnome or eog), I did’nt find how to put the page in landscape mode.
Solution: before printing, just rotate the image in eog, then print the image.
If you discover lots of ssh connection tries in your /var/log/auth.log (bots testing users/passwords), you have to do something.
The simpler is to use an IP restriction rule in your iptables firewall, or in /etc/hosts.deny
If you don’t want or can’t use this restriction, use Fail2ban:
aptitude install fail2ban
The default install blocks SSH connection tries.
You can tune the config a bit or activate Fail2ban for other services. Example:
vi /etc/fail2ban/jail.conf bantime = 86400 maxretry = 10 # pour ssh enabled = true # pour vsftpd maxretry = 10 # pour vsftpd
Then, the iptables -L command gives you all banned IP addresses.
In the vast majority of cases, http redirections are installed on the http server.
However, the redirection cannot be installed in the http server config in some cases.
Example: mobile phone redirection.
We want to redirect all mobile phones from http://www.mysite.com to http://mobile.mysite.com
The client type is done with the HTTP User-Agent header sent by the browser. Problem: Squid will put in cache only one version of the query to http://www.mysite.com. The response from the cache will probably be the home page, not the 301 redirection.
It’s also possible to configure the HTTP server to add the Vary: User-Agent header to tell Squid to store one version by browser. With this the cache will be split (one cache per browser), lowering a lot the cache efficiency.
Here is the solution:
################################### # we redirect mobiles to mobile.mysite.com url_rewrite_program /etc/squid/redirect_mobile.sh acl symbian browser Symbian acl iphone browser iP(hone|od) acl mobile_url dstdomain mobile.monsite.com url_rewrite_access deny mobile_url url_rewrite_access allow symbian url_rewrite_access allow iphone url_rewrite_access deny all
And the /etc/squid/redirect_mobile.sh script simply contains:
#!/bin/sh
while read line
do
echo "301:http://mobile.mysite.com"
done
Notes:
- The mobile detection method is far from being exhaustive. If you know a simple method covering 95% of browsers, I’m interested!
- With more recent Squid versions (3, 2.HEAD), you can use a better method using internal redirectors.
Links:
Sorry, this entry is only available in Français.
Sorry, this entry is only available in Français.
Sorry, this entry is only available in Français.
Sorry, this entry is only available in Français.
Sorry, this entry is only available in Français.