I know how to send WOL command using Linux. But, how do I send Wake on LAN (WOL) frames to hosts on a local Ethernet network using FreeBSD operating systems to wake up my servers?
How do I display a list of bridges under Linux? How do I show info about the Ethernet bridge configuration in the Linux kernel?
Q. My Ethernet aliases are randomly switched and they are bound to the wrong interface. My eth0 became eth1 and eth1 become eth0. This is causing all sort of trouble for services and firewall configurations. How do I swap back and make sure Ethernet aliases works correctly under CentOS Linux server?
Q. Recently we made changes to our server hardware and swapped all IP address from old to a new server. However, 2 IP addresses are not get updated due to arp cache issues (IPs are cached on the router). They are going to other servers. How do I solve this problem under Redhat Enterprise Linux version 5.0 or any other Linux distribution?
Continue reading “Router ARP Cache is Not Releasing Linux / UNIX Server IP address”
Q. I’m using squid proxy server under CentOS Linux version 5. How to filter a particular MAC address under squid?
A. Not all operating system supports Mac address based filtering. For some operating systems. Squid calls these “ARP ACLs” and they are supported on Linux, Solaris, and BSD variants.
How do I set up ACL’s based on MAC address?
# vi /etc/squid/squid.conf
Local acl, section and append ACL as follows:
acl macf1 arp mac-address
acl macf2 arp 00:11:22:33:44:55
http_access allow macf1
http_access allow macf2
http_access deny all
Save and close the file. Restart squid server:
# /etc/init.d/squid restart
How do I display or find out the MAC address for my small home / business router?