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4G Router link is flapping

Arvin Carlos

Hello,

 

We ditch out our ADSL lines for cost cutting reason, we acquire a bunch of 4G routers, and we have this strange issues of links are coming up and down from the email notifications, automatic uplink monitoring is turned off and we point the monitoring host to 8.8.4.4 google dns server, i check the service monitors and im always seeing this logs, kindly explain please what is the meaning of this;

 

 

2018:02:19-08:08:43 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"

2018:02:19-08:08:42 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"
2018:02:19-08:08:42 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"
2018:02:19-08:08:42 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"
2018:02:19-08:08:43 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"
2018:02:19-08:08:43 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"
2018:02:19-08:08:43 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"
2018:02:19-08:08:43 astaro service_monitor[22749]: id="4002" severity="info" sys="System" sub="loadbalancing" name="ICMPv4 out of sequence!"


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  • 0

    Please tell us what Sophos Support says about this.  I did a Google on "ICMPv4 out of sequence!" and your post was the only thing found on the Internet.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • +1 in reply to BAlfson

    Hello, 

     

    The four 4G routers we acquire is using CGNAT from the ISP, maybe the NAT is overwhelmed or max  multiplexed from the ISP side,  and we cannot find a good host outside for the link monitoring, even making it to point to google dns servers and using UDP 53,   also checking the automatic monitoring will make it worst since Sophos is using root DNS servers which the routers sometimes cannot contact, a solution we made, since the three WAN  links are DHCP's, we point the host monitoring to its local gateway (private IP's)..is this a good practice? but this is only the stable solution for now that is working.

     

    2018:02:22-12:02:37 astaro service_monitor[26623]: id="4000" severity="info" sys="System" sub="loadbalancing" name="multipath 3 ICMP 192.168.79.1 changed state to ONLINE"
    2018:02:22-12:02:37 astaro service_monitor[26623]: id="4000" severity="info" sys="System" sub="loadbalancing" name="multipath 1 ICMP 192.168.77.1 changed state to ONLINE"
    2018:02:22-12:02:37 astaro service_monitor[26623]: id="4000" severity="info" sys="System" sub="loadbalancing" name="multipath 4 ICMP 192.168.80.1 changed state to ONLINE"
    2018:02:22-12:02:37 astaro service_monitor[26623]: id="4000" severity="info" sys="System" sub="loadbalancing" name="multipath 2 ICMP 192.168.78.1 changed state to ONLINE"
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