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Add comprehensive OSPF routing filter rules with documentation #10

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gpas45 merged 2 commits into from
Jun 12, 2026
Merged

Add comprehensive OSPF routing filter rules with documentation #10

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Improve OSPF filter rules: comments, explicit reject, default-route d…
claude Jun 12, 2026
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Remove explicit default-route reject from OSPF filters
claude Jun 12, 2026
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41 changes: 35 additions & 6 deletions routeros/ospf_filter_rules
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Original file line number Diff line number Diff line change
@@ -1,7 +1,36 @@
# OSPF routing filters (RouterOS 7.x)
# Пропускает в/из OSPF только локальные RFC1918-сети, остальное отбрасывает.
# Цель: не дать «протечь» в домен маршрутизации публичным префиксам,
# default-route и чужим сетям.
#
# ВАЖНО: одни правила фильтра ничего не делают, пока они не привязаны к
# OSPF-инстансу через in-filter-chain / out-filter-chain (см. секцию ниже).

# ---------------------------------------------------------------------------
# Цепочки фильтров
# ---------------------------------------------------------------------------
/routing filter rule
add chain=ospf-in disabled=no rule="if (dst in 192.168.0.0/16 && dst-len in 16-32) {accept;}"
add chain=ospf-in disabled=no rule="if (dst in 10.0.0.0/8 && dst-len in 8-32) {accept;}"
add chain=ospf-in disabled=no rule="if (dst in 172.16.0.0/12 && dst-len in 12-32) {accept;}"
add chain=ospf-out disabled=no rule="if (dst in 192.168.0.0/16 && dst-len in 16-32) {accept;}"
add chain=ospf-out disabled=no rule="if (dst in 10.0.0.0/8 && dst-len in 8-32) {accept;}"
add chain=ospf-out disabled=no rule="if (dst in 172.16.0.0/12 && dst-len in 12-32) {accept;}"
# --- ospf-in: какие маршруты ПРИНИМАЕМ из OSPF в таблицу маршрутизации ---
add chain=ospf-in comment="accept 10.0.0.0/8" rule="if (dst in 10.0.0.0/8 && dst-len in 8-32) {accept;}"
add chain=ospf-in comment="accept 172.16.0.0/12" rule="if (dst in 172.16.0.0/12 && dst-len in 12-32) {accept;}"
add chain=ospf-in comment="accept 192.168.0.0/16" rule="if (dst in 192.168.0.0/16 && dst-len in 16-32) {accept;}"
add chain=ospf-in comment="reject the rest (explicit)" rule="reject;"

# --- ospf-out: какие маршруты ОТДАЁМ (redistribute) в OSPF ---
add chain=ospf-out comment="accept 10.0.0.0/8" rule="if (dst in 10.0.0.0/8 && dst-len in 8-32) {accept;}"
add chain=ospf-out comment="accept 172.16.0.0/12" rule="if (dst in 172.16.0.0/12 && dst-len in 12-32) {accept;}"
add chain=ospf-out comment="accept 192.168.0.0/16" rule="if (dst in 192.168.0.0/16 && dst-len in 16-32) {accept;}"
add chain=ospf-out comment="reject the rest (explicit)" rule="reject;"

# ---------------------------------------------------------------------------
# Привязка цепочек к OSPF-инстансу (раскомментируй и укажи имя инстанса)
# ---------------------------------------------------------------------------
# /routing ospf instance
# set [find name="default"] in-filter-chain=ospf-in out-filter-chain=ospf-out

# Подсказки:
# - Конечное reject — поведение по умолчанию у /routing filter, добавлено
# явно для самодокументируемости.
# - Если нужно резать слишком специфичные маршруты (например, /32-хосты),
# ужесточи верхнюю границу dst-len, напр. "dst-len in 8-24".
# - Имя инстанса смотри в: /routing ospf instance print
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