gre-plus-ipsec-debian.md
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@@ -12,7 +12,7 @@
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## Define an IPsec security policy
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Example policy on 1.2.3.4:
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-```
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+```bash
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#!/usr/sbin/setkey -f
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spdadd 1.2.3.4 5.6.7.8 gre -P out ipsec esp/transport//require;
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spdadd 5.6.7.8 1.2.3.4 gre -P in ipsec esp/transport//require;