Bringing up an alias interface with the ifconfig command caused a loss of connectivity

Solution Verified - Updated -

Issue

  • After bringing up an alias interface with the ifconfig command, all network connectivity was lost.
  • The command was run this way:
# ifconfig eth0:1 172.10.10.12 up
  • The routing table was altered in the following ways.
# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
172.10.10.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
172.10.10.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0 <------Here
0.0.0.0         172.10.10.1     0.0.0.0         UG        0 0          0 eth0

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.