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Originally Posted by KBr
To my understanding the filter on my default router (192.168.1.5) redirects outbound packets from the subnet 192.168.1.0 - say the host 192.168.1.10 - to the router 192.168.1.254 without touching them.
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If your default router is OpenBSD, PF will be affected by rules or option settings affecting traffic normalization (scrub, and related rules and options). If packet reassembly is turned off in your PF configuration, PF might be blocking packet fragments which you expect to be passed. The example given in pf.conf(5) is of a fragment that can't possibly match a pass rule that uses TCP port numbers.
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Is there a way to upgrade the router directly from 5.0 to 5.2?
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No. The method is to upgrade from 5.0 -> 5.1 -> 5.2. The OS upgrade process is quick and easy if you use sysmerge(8) to automate updates within /etc.
Always review the upgrade guides as from time to time there are manual steps to take, such as adjusting for syntax changes within an /etc file you have customized.
To update your packages, that's as easy as
# pkg_add -ui once you are on 5.2 and have updated your $PKG_PATH accordingly.