diff --git a/utils/he_ipv6/tpl/_common.j2 b/utils/he_ipv6/tpl/_common.j2
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+++ b/utils/he_ipv6/tpl/_common.j2
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+{#- This is a set of common options between DNSMasq and RADVD. Or they're easier to just define here. -#}
+{#- ## SLAAC OPTIONS ## -#}
+{#- Is it 1480 or 1280? Arch wiki says 1480, but everything else (older) says 1280. -#}
+{#- set mtu = 1280 -#}
+{%- set mtu = 1480 -%}
+{#- Minimum seconds allowed between sending unsolicited multicast RAs. 3 < x < (0.75 * max_inter) -#}
+{#- If using Mobile Extensions, 0.33 < x (0.75 * max_inter) -#}
+{%- set min_inter = 60 -%}
+{#- Maximum seconds allowed between sending unsolicited multicast RAs. 4 < x < 1800 -#}
+{#- If using Mobile Extensions, 0.07 < x 1800 -#}
+{%- set max_inter = 600 -%}
+{#- Minimum seconds between sending multicast RAs (solicited and unsolicited). -#}
+{#- If using Mobile Extensions, 0.03 < x -#}
+{%- set min_delay = 3 -%}
+{#- ## DHCPv6 OPTIONS ## -#}
+{#- Obviously, these only works for DNSMasq. -#}