ICMP redirect packets ignored

Solution Unverified - Updated -

Issue

  • The router/default gateway sends out ICMP redirects to a RHEL box that seems to ignore them
    • No correct routing entries can be found in the router cache after redirects.
  • The redirect is not subject to any of the reject conditions seen in the code
    • The new gateway is not the same as the default gateway
    • all.except_redirects and eth0.accept_redirects are both 1
    • all.forwarding and eth0.forwarding are both 1
    • There are no error messages in the logs about rt_cache rebuilding
    • New gateway is on the local network
    • Shared media and secure redirects are off
    • The new gateway is a normal unicast IP
  • Probing shows that the reject conditions are not misfiring

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

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
Close

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