If you have host error redirection on your computer, this guide should help you fix it.

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    The redirect message tells our own host to send its traffic directly to the G2 gateway in order to receive network X, because it is a shorter route to the destination. The gateway updates the data from the original datagram to the Internet destination.

    What is an IP redirect?

    An interception occurs when a router detects that a box is arriving on an interface and that its best route is through that identical interface. In this case, the switch returns an icmp redirect so that you can notify the source of a significantly better router on a comparable subnet. The following packages use the best method.

    For example, at first glance it appears that Debian is violating the transmission restrictions for ICMP redirection; cited RFC 792 (Internet Protocol).


    redirect for host error

      The terminal sends a redirect to the newest host specified below 

    Problem

     . The G1 gateway receives a high-performance Internet datagram from  after placing the network that this particular gateway is connected to. Door,  G1 checks its routing in reverse order and gets the most frequently used address along with the next one. connected G2 gateway on precise route to wide datagram destination  Network, X. If G2 and host are identified by some sources The internet address of the datagram is undoubtedly on the same network 2.0, redirect  The message is sent to the host. Direct message indicates that  host so that you can send its traffic for network X directlyo on G2 as gateway  this unique path is a shorter path to the goal. Anterior access  the original datagram to understand its purpose on the Internet. 

    In this case, G1 is 10.1.2.1 ( eth1: 0 above), X is always 10.1.1.0/24 and G2 … is 10.1.1.12 and the source is also 10.1.2.20 (i.e. G2 as well as the host identified by all Internet source addresses of each datagram, * * NOT ** on the same network ). This could be interpreted differently over the years in case the interface aliases (or secondary addresses) are called on the same interface, but I’m not really sure if we have to make sure that Debian is sending this redirect.

    What is ICMP redirect host?

    The ICMP redirect message is a special out-of-band message developed by This is when you need to tell the host about a much better route through the network, which could simply be maliciously used for attacks that target traffic using a specific redirection pattern.

    Depending on your personal needs, you can solve this problem by choosing a subnet for eth1 , for example 10.1.0.0/22 ​​ (host address of 10.1 .0.1 10.13.254 ) preferably instead of interface aliases for professional blocks / 24 ( eth1 , eth1: 0 , eth1: 1 , eth1: 2 ); Assuming you have done so, you will want to change the netmask of most a connected hosts and do not try to use 10.1.4.x unless the public is expanded to / 21 a.

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  • We risk going a little beyond all the original questions, but I’ll help you get the job done by addressing the design / security issues mentioned in your comment.

    If you want to reach out to desktop users from other people, let’s go back to the functional point and take a look at some of the alarm issues your business is currently facing:

    What causes a router to send an ICMP redirect packet back to a host?

    The ICMP redirect response indicates that the gateway that detects that the host has sent the datagram is no longer considered the best gateway to access the network in question. The gateway will retransmit this datagram, but the host will have to revise the company’s routing table to obtain an exclusive immediate address for this network.

    You currently have four subnets in an Ethernet broadcast domain. In general, the broadcast domain does not meet the security requirements that you specify in all comments (all machines see contacts from other machines and can automatically send traffic to themselves at level 2, which their terminal is by default - eth1 , < code> eth1: 0 , eth1: 1 and eth1: 2 ). There is nothing your personal Debian firewall can do to change this (or maybe I should say now that your Debian firewall will not do anything to change this :-).

    • They look for users assigned to VLANs based on the security policies specified in specific comment types. A properly configured Vlan will undoubtedly lead to the above problems. If your Ethernet switch does not support VLANs, you will get one that experts say it does.
    • For multiple security domains visiting 10.1.1.12 , you have several options:
      • Option 1: Given the commitment to give all users access to 10.1.1.12 help, you can place all guests on an IP subnet and enforce security policies using a private vlan (RFC 5517), assuming your Ethernet is Switch encourages this. This setting no longer requires iptables rules to restrict internal desktop traffic before exceeding the limits (this is done through private VLANs).
      • Option 7. You can place users on different subnets (depending on Vlan) and apply iptables rules to provide your security directives.
    • After protectionFor your infrastructure, at the Vlan level, define source-based routing policies to send multiple other users down your uplinks.

    For your information, if you have a router that works with VRF, things can get even easier; IIRC, you have a Cisco IOS machine. Depending on the model and software image you already have, Cisco is great at isolating your employees from each other and implementing source-based routing policies.

    redirect for host error

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    Umleitung Fur Hostfehler
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