Alias bug: dashed IP range vs CIDR IP range
I ran into a truly pathological bug in the support for a dashed IP range alias versus a multi-CIDR IP range alias, which took me many hours to track down.
According to what I have read in the past, PFSense claims to support dashed IP aliases, such as
126.96.36.199-8, instead of having to use
188.8.131.52/32and whatever other weird small CIDR blocks are needed to include the dashed IP range.
However, when I create such an alias, and integrate that alias by name into another alias, I am finding that the end alias contains corrupted / missing IPs when you verify it using
sudo pfctl -t top_alias_name -T show. After replacing the contents of the dashed IP alias, with the weird CIDR blocks it takes to represent it, the IPs began to properly appear inside of the
I wanted to see if anybody else ran into bizarre issues like this, and how I might do some more work to help identify the root cause of this issue most effectively so we can get it fixed for others.
I encountered the issue, when I was finding that some clients specified in a dashed IP range on a NAT rule, were unable to connect to an internal resource via a port forward containing a dashed IP alias inside of the alias used to configure the port forward rule.
What is the exact input you used to make the alias?
The format for a "dash" alias isn't short like you showed, it would be
184.108.40.206-220.127.116.11. When saved, it would translate that into an equivalent set of CIDR blocks and it wouldn't store the dash range.
Thanks for the eagle eye, Jim. I had used "18.104.22.168-8", which is as you said apparently incorrect, but somehow the system still accepted this input, didn't produce any CIDRs in a conversion, and generated an invalid peer list for the affected alias. Should I file a bug? I am rather curious if somebody can reproduce it in their environment or if I managed to find a one-off somehow.
It might be an edge case we can't really detect well since it may be valid in some other way, even if it isn't an IP address (e.g. a hostname, other alias name, etc)