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-rw-r--r--etc/sysctl.d/99-sysctl.conf5
1 files changed, 5 insertions, 0 deletions
diff --git a/etc/sysctl.d/99-sysctl.conf b/etc/sysctl.d/99-sysctl.conf
index 3177c28..fc01611 100644
--- a/etc/sysctl.d/99-sysctl.conf
+++ b/etc/sysctl.d/99-sysctl.conf
@@ -30,3 +30,8 @@ net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv4.conf.all.log_martians = 1
+
+# IP forwarding for NAT bridges (libvirt's virbr0, waydroid's waydroid0).
+# libvirtd and waydroid both rely on the host routing between their bridge
+# and the upstream NIC; without this they get no internet.
+net.ipv4.ip_forward = 1