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Cant get a simple directly connected network firewall rule working. XGS126

I am completely stumped by this.  I am sure its something obvious that I am overlooking. 

Lan Port 1 -

MGMT port 5 -

I already had a rule saying mgmt subnet source could access lan subnet destination   That worked fine, the mgmt server ( can RDP etc to the LAN server (

but then the server engineer said could I allow access from mgmt server to the LAN server ilo (   First off I couldnt work out why this wasnt just working with the above rule.

So set up a separate rule above the other one just for mgmt server to lan server ilo but when I ping or try access it it doesnt work. I can see the out counter slightly increasing on the rule.  

In the firewall logs I can see the rule being hit and being allowed. 

What am I missing?  I know the ilo is working fine as it is reachable from the lan network server so ive got past it being a physical (cable, connection) issue.

Added TAGs
[edited by: Raphael Alganes at 2:52 PM (GMT -7) on 23 Apr 2024]
  • Hi  Can you please check CLI TCPDUMP on the firewall for the destination server IP to see if we are getting an ICMP reply while you are checking PING from the MGMT server?

    console> tcpdump 'host and proto ICMP
    console> drop 'host

    If the Firewall is forwarding packets out to Port1 (LAN zone interface) and there is no reply back from the LAN server and no drop packet on the firewall with the above command then try with a separate rule by creating a link NAT rule with MASQ action to see how it goes or if the separate rule is already added by you for specific source and destination then crate link NAT rule for that firewall rule with NAT action MASQ.

    After that check TCPDUMP and drop again with the shared command above..!


    Vishal Ranpariya
    Technical Account Manager | Sophos Technical Support

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  • console> tcpdump 'host and proto ICMP'                            
    tcpdump: verbose output suppressed, use -v or -vv for full protocol decode      
    listening on any, link-type LINUX_SLL (Linux cooked v1), capture size 262144 byt
    13:25:00.682319 Port5, IN: IP > ICMP echo request, id 
    1, seq 73, length 40                                                            
    13:25:00.682680 Port1, OUT: IP > ICMP echo request, id
     1, seq 73, length 40                                                           
    13:25:00.682686 mv-pcimux0, OUT: IP > ICMP echo reques
    t, id 1, seq 73, length 40                                                      
    13:25:05.467696 Port5, IN: IP > ICMP echo request, id 
    1, seq 74, length 40                                                            
    13:25:05.467823 Port1, OUT: IP > ICMP echo request, id
     1, seq 74, length 40                                                           
    13:25:05.467828 mv-pcimux0, OUT: IP > ICMP echo reques
    t, id 1, seq 74, length 40                                                      
    13:25:10.465974 Port5, IN: IP > ICMP echo request, id 
    1, seq 75, length 40                                                            
    13:25:10.466047 Port1, OUT: IP > ICMP echo request, id
     1, seq 75, length 40                                                           
    13:25:10.466054 mv-pcimux0, OUT: IP > ICMP echo reques
    t, id 1, seq 75, length 40                                                      
    13:25:15.466716 Port5, IN: IP > ICMP echo request, id 
    1, seq 76, length 40                                                            
    13:25:15.466774 Port1, OUT: IP > ICMP echo request, id
     1, seq 76, length 40                                                           
    13:25:15.466778 mv-pcimux0, OUT: IP > ICMP echo reques
    t, id 1, seq 76, length 40   

  • Ive just put Masq on the separate rule and now the traffic is working.  Can you explain why masq nat is needed for that rule but not the main MGMT subnet can access the Lan subnet fine?  Thats is really confusing to me.


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