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--- cluster:102 [2011/06/29 15:59] – hmeij
+++ cluster:102 [2020/08/24 11:19] (current) – hmeij07
@@ Line 2: / Line 2: @@
 **[[cluster:0|Back]]**
-This is my second NAT story, for the first one look at [[cluster:51|The Story Of NAT, part 1]]
+Note #1
+CentOS 8.1 with the standard firewalld.\\
+If this is of interest to you this was how I managed to get it work:
+<code>
+EXTIFACE=MASTER_NODE_EXT_INTERFACE_DEVICE (e.g. eno1)
+INTIFACE=MASTER_NODE_INTERNAL_INTERFACE_DEVICE (e.g. eno2)
+INTIPADDR=MASTER_IP_OF_INTERNAL_IFAC
+PREFIX=PREFIX_OF_INTERNAL_NETWORK
+firewall-cmd --change-interface=${EXTIFACE} --zone=public
+firewall-cmd --change-interface=${INTIFACE} --zone=trusted --permanent
+firewall-cmd --permanent --direct --passthrough ipv4 -t nat -I POSTROUTING -o ${EXTIFACE} -j MASQUERADE -s ${INTIPADDR}/${PREFIX}
+firewall-cmd --set-default-zone=trusted
+firewall-cmd --reload
+</code>
+And make sure the default route is set on all compute nodes.
+Note #2
+configured Shorewall on a cluster to do NAT through the head node.
+Edit the file /etc/shorewall/snat   and add this line:
+<code>
+MASQUERADE 192.168.0.0/24      eno1
+</code>
+where 192.168.0 is the address range of your node interfaces - clearly you need to change this to fit
+en01 is the external interface on the head node
+My /etc/shorewall/interfaces contains this (forwarding ib0)
+<code>
+nat     eno1    detect  dhcp
+nat     ib0     detect  dhcp
+</code>
+so substitute ib0 for your internal ethernet interface
 ==== NAT Story, part 2 ====
+This is my second NAT story, for the first one look at [[cluster:51|The Story Of NAT, part 1]]
 Writing this up so I will remember what I did, and why.  Basic problem is this: How do you make a filesystem in a public VLAN available on a private network?  One solution is to work with Network Address Translation, or NAT in short.  More information at [[http://en.wikipedia.org/wiki/Network_address_translation|http://en.wikipedia.org/wiki/Network_address_translation]]