hardware:gatewaynetflow
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hardware:gatewaynetflow [2019/01/03 17:36] – [How to redirect Netflow to Trisul across network segments using NAT] veera | hardware:gatewaynetflow [2019/01/03 18:35] – [How to redirect Netflow to Trisul across network segments using NAT] veera | ||
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====== How to redirect Netflow to Trisul across network segments using NAT ====== | ====== How to redirect Netflow to Trisul across network segments using NAT ====== | ||
- | In some customers, Trisul is on a separate segment from the production routers. These sites often have a gateway device that be be used to access. | + | In some customers, Trisul is often deployed |
{{: | {{: | ||
- | This HOWTO explains how to use Linux IPTABLES NAT to move between | + | This HOWTO explains how to use Linux IPTABLES NAT to solve the issue. |
===== IPTABLES Port based NAT ===== | ===== IPTABLES Port based NAT ===== | ||
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On the gateway device you just need to run the following commands, say you want to move port 2055 to a particular IP. | On the gateway device you just need to run the following commands, say you want to move port 2055 to a particular IP. | ||
- | Shutdown ufw or disable firewalld | + | ==== Shutdown ufw or disable firewalld |
+ | |||
+ | since we are working directly with iptables. | ||
< | < | ||
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- | Then setup the Port NAT | + | ==== Then setup the Port NAT ==== |
+ | |||
+ | The following commands move port 2055 to the Trisul IP (see the diagram above) . | ||
< | < | ||
- | $ iptables -t nat -A PREROUTING -p udp --dport 2055 -j DNAT --to-destination 10.10.10.17: | + | $ iptables -t nat -A PREROUTING -p udp \ |
- | $ iptables -t nat -A POSTROUTING -j MASQUERADE | + | |
</ | </ | ||
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You should now be seeing Netflow | You should now be seeing Netflow | ||
+ | |||
+ | <note important> | ||
+ | </ | ||
+ | ==== Useful commands ==== | ||
+ | |||
+ | To view NAT rules with counters | ||
+ | '' | ||
+ | iptables -t nat -vL | ||
+ | |||
+ | '' | ||
+ | ==== Reference ==== | ||
+ | Forwarding and NAT with IPTABLES : Redhat https:// |
hardware/gatewaynetflow.txt · Last modified: 2019/01/07 11:45 by veera