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+---
+title: Routing with RHEL
+linktitle: Routing with RHEL
+description: Routing with RHEL
+tags: ['rhel']
+---
+
+- [RHEL9 Router Installation](#rhel9-router-installation)
+  - [`subscription-manager` Setup](#subscription-manager-setup)
+  - [RHEL9 Router Installation - Network](#rhel9-router-installation---network)
+  - [Enable IP Forwarding](#enable-ip-forwarding)
+  - [Configure the Firewall](#configure-the-firewall)
+  - [Setup DHCP Server](#setup-dhcp-server)
+
+## RHEL9 Router Installation
+
+- Installed basic RHEL9 VM on vSphere
+  - set hostname
+  - configure network
+  - select installation source and destination
+  - add a new user
+    - set passwords
+
+### `subscription-manager` Setup
+
+If not already done during installation:
+
+```code
+subscription-manager register --org="" --activationkey=""
+```
+
+Checkt the repos:
+
+```code
+dnf repolist
+Updating Subscription Management repositories.
+repo id                                                                                   repo name
+rhel-9-for-x86_64-appstream-rpms                                                          Red Hat Enterprise Linux 9 for x86_64 - AppStream (RPMs)
+rhel-9-for-x86_64-baseos-rpms                                                             Red Hat Enterprise Linux 9 for x86_64 - BaseOS (RPMs)
+```
+
+- needed packages post-install:
+
+```code
+dnf install -y \
+  dnsmasq \
+  firewalld \
+  tcpdump \
+  bind-utils \
+  vim
+```
+
+### RHEL9 Router Installation - Network
+
+VM got configured with three vNICs. Each assigned to a specific Distributed Port-Group in vSphere:
+
+```code
+ip -br a
+
+lo               UNKNOWN        127.0.0.1/8 ::1/128
+ens33            UP             10.32.111.8/20 2620:52:0:2060:250:56ff:fe88:71f7/64 fe80::250:56ff:fe88:71f7/64
+ens34            UP             192.168.202.10/24 fe80::2e60:26f7:eca5:3311/64
+ens35            UP             192.168.204.10/24 fe80::4659:fe20:d534:9e48/64
+```
+
+`ens33` is connected to a DHCP network and has already got an IP assigned.
+
+Network 2 and 3 will be static.
+
+```code
+nmcli con add type ethernet ifname ens34 con-name lan2 \
+  ipv4.method manual ipv4.addresses 192.168.202.10/24
+```
+
+```code
+nmcli con add type ethernet ifname ens35 con-name lan3 \
+  ipv4.method manual ipv4.addresses 192.168.204.10/24
+```
+
+Activate ncs:
+
+```code
+nmcli con up lan2 && nmcli con up lan3
+```
+
+### Enable IP Forwarding
+
+Enable IP Forwarding (Mandatory):
+
+```code
+echo "net.ipv4.ip_forward = 1" > /etc/sysctl.d/99-router.conf \
+sysctl --system
+```
+
+### Configure the Firewall
+
+Configure Firewall and NAT (firewalld):
+
+RHEL 9 uses nftables via firewalld.
+
+```code
+firewall-cmd --permanent --zone=external --add-interface=ens33
+firewall-cmd --permanent --zone=internal --add-interface=ens34
+firewall-cmd --permanent --zone=internal --add-interface=ens35
+```
+
+Enable Masquerading on WAN:
+
+```code
+firewall-cmd --permanent --zone=external --add-masquerade
+firewall-cmd --permanent --zone=internal --add-masquerade
+```
+
+Allow Forwarding Between Zones:
+
+```code
+firewall-cmd --permanent --zone=internal --add-forward
+```
+
+Configure Policies accordingly:
+
+```code
+sudo firewall-cmd --permanent --new-policy=internal-external
+sudo firewall-cmd --permanent --policy=internal-external --set-target=ACCEPT
+sudo firewall-cmd --permanent --policy=internal-external --add-masquerade
+sudo firewall-cmd --permanent --policy=internal-external --add-ingress-zone=internal
+sudo firewall-cmd --permanent --policy=internal-external --add-egress-zone=external
+sudo firewall-cmd --reload
+```
+
+```code
+firewall-cmd --reload
+```
+
+### Setup DHCP Server
+
+Install and Configure DHCP (dnsmasq). `dnsmasq` is lightweight and ideal for this role.
+
+```code
+dnf install -y dnsmasq
+```
+
+Configuration
+
+Edit `/etc/dnsmasq.d/router.conf`:
+
+```code
+# Network 2
+interface=ens34
+dhcp-range=ens34,192.168.202.100,192.168.202.150,12h
+dhcp-option=ens34,option:router,192.168.202.10
+dhcp-option=ens34,option:dns-server,10.32.96.1
+
+# Network 3
+interface=ens35
+dhcp-range=ens35,192.168.204.100,192.168.204.150,12h
+dhcp-option=ens35,option:router,192.168.204.10
+dhcp-option=ens35,option:dns-server,10.32.96.1
+```
+
+Start and Enable:
+
+```code
+systemctl enable --now dnsmasq
+```
+
+The leases can be read using `tail -f /var/lib/dnsmasq/dnsmasq.leases`.
+
+Firewall: Allow DHCP Traffic:
+
+```code
+firewall-cmd --permanent --zone=internal --add-service=dhcp
+firewall-cmd --reload
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index eed101dc..1bf3fde1 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -288,6 +288,7 @@ nav:
 
   - My Lab notes:
       - my-lab/index.md
+      - RHEL Router: my-lab/rhel-router.md
       - Hetzner Storage Box: my-lab/storage-box.md
       - Local fedora: my-lab/local-fedora.md
       - SSH: my-lab/ssh.md