iptables: Logging connections on port 25/TCP

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I have KVM virtualization. I have over 60 interfaces:



vnet1-60 - virtual;
vmbr0 - bridge;
enp2s0f0 - PHYSOUT;


I need to know how many connection make each vnet interface.
I have a rule like: 



iptables -A FORWARD -o vnet1 -m state -p tcp --dport 25 --state NEW -j 
LOG --log-level 7 --log-prefix "25port: "


... but no result. Same no result:



-A OUTPUT -o vnet*;
-A OUTPUT -o vnet55,vnet56; 
-A OUTPUT -o enp2s0f0;


I get logs only when I use this:



-A FORWARD -o vmbr0 -s 123.0.0.0/8 -m state -p tcp --dport 25 --state 
NEW -j LOG --log-level 7 --log-prefix "25port: "


... but this is not correct, because vmbr is the bridge.
How I can get traffic logs from virtual interfaces on port 25?




iptables logs kvm smtp




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  • ebtables.netfilter.org/misc/ebtables-faq.html#quiz3
    – A.B
    May 8 at 14:33














up vote
0
down vote

favorite












I have KVM virtualization. I have over 60 interfaces:



vnet1-60 - virtual;
vmbr0 - bridge;
enp2s0f0 - PHYSOUT;


I need to know how many connection make each vnet interface.
I have a rule like: 



iptables -A FORWARD -o vnet1 -m state -p tcp --dport 25 --state NEW -j 
LOG --log-level 7 --log-prefix "25port: "


... but no result. Same no result:



-A OUTPUT -o vnet*;
-A OUTPUT -o vnet55,vnet56; 
-A OUTPUT -o enp2s0f0;


I get logs only when I use this:



-A FORWARD -o vmbr0 -s 123.0.0.0/8 -m state -p tcp --dport 25 --state 
NEW -j LOG --log-level 7 --log-prefix "25port: "


... but this is not correct, because vmbr is the bridge.
How I can get traffic logs from virtual interfaces on port 25?




iptables logs kvm smtp




share|improve this question





















  • ebtables.netfilter.org/misc/ebtables-faq.html#quiz3
    – A.B
    May 8 at 14:33












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have KVM virtualization. I have over 60 interfaces:



vnet1-60 - virtual;
vmbr0 - bridge;
enp2s0f0 - PHYSOUT;


I need to know how many connection make each vnet interface.
I have a rule like: 



iptables -A FORWARD -o vnet1 -m state -p tcp --dport 25 --state NEW -j 
LOG --log-level 7 --log-prefix "25port: "


... but no result. Same no result:



-A OUTPUT -o vnet*;
-A OUTPUT -o vnet55,vnet56; 
-A OUTPUT -o enp2s0f0;


I get logs only when I use this:



-A FORWARD -o vmbr0 -s 123.0.0.0/8 -m state -p tcp --dport 25 --state 
NEW -j LOG --log-level 7 --log-prefix "25port: "


... but this is not correct, because vmbr is the bridge.
How I can get traffic logs from virtual interfaces on port 25?




iptables logs kvm smtp




share|improve this question













I have KVM virtualization. I have over 60 interfaces:



vnet1-60 - virtual;
vmbr0 - bridge;
enp2s0f0 - PHYSOUT;


I need to know how many connection make each vnet interface.
I have a rule like: 



iptables -A FORWARD -o vnet1 -m state -p tcp --dport 25 --state NEW -j 
LOG --log-level 7 --log-prefix "25port: "


... but no result. Same no result:



-A OUTPUT -o vnet*;
-A OUTPUT -o vnet55,vnet56; 
-A OUTPUT -o enp2s0f0;


I get logs only when I use this:



-A FORWARD -o vmbr0 -s 123.0.0.0/8 -m state -p tcp --dport 25 --state 
NEW -j LOG --log-level 7 --log-prefix "25port: "


... but this is not correct, because vmbr is the bridge.
How I can get traffic logs from virtual interfaces on port 25?





iptables logs kvm smtp





share|improve this question












share|improve this question




share|improve this question








edited May 8 at 11:28









Rui F Ribeiro

34.5k1269113




34.5k1269113









asked May 8 at 9:38









Mr Vladimir

1




1











  • ebtables.netfilter.org/misc/ebtables-faq.html#quiz3
    – A.B
    May 8 at 14:33
















  • ebtables.netfilter.org/misc/ebtables-faq.html#quiz3
    – A.B
    May 8 at 14:33















ebtables.netfilter.org/misc/ebtables-faq.html#quiz3
– A.B
May 8 at 14:33




ebtables.netfilter.org/misc/ebtables-faq.html#quiz3
– A.B
May 8 at 14:33










1 Answer
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You need to load the br_netfilter module, and then enable iptables for bridged traffic, by means of



echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables


See "What's bridge-netfilter?"






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    up vote
    1
    down vote













    You need to load the br_netfilter module, and then enable iptables for bridged traffic, by means of



    echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables


    See "What's bridge-netfilter?"






    share|improve this answer

























      up vote
      1
      down vote













      You need to load the br_netfilter module, and then enable iptables for bridged traffic, by means of



      echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables


      See "What's bridge-netfilter?"






      share|improve this answer























        up vote
        1
        down vote










        up vote
        1
        down vote









        You need to load the br_netfilter module, and then enable iptables for bridged traffic, by means of



        echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables


        See "What's bridge-netfilter?"






        share|improve this answer













        You need to load the br_netfilter module, and then enable iptables for bridged traffic, by means of



        echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables


        See "What's bridge-netfilter?"







        share|improve this answer













        share|improve this answer



        share|improve this answer











        answered May 8 at 11:17









        Ralph Rönnquist

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