So when you put an interface in netmap mode, you can kill a lot of other core functionality. Netmap also interferes with things like limiters, traffic shapers and even the basic packet throughput stats. Netmap does not work well with VLANs because the VLAN stuff is not passed up to it. Couple that with the move to iflib in FreeBSD-12, and you have a recipe for headaches. There have been at least three pretty big changes to the netmap device API over the years. At first it sounded great, but the implementation of netmap within FreeBSD has been, I will say diplomatically, "difficult to work with" at best.
The whole netmap-based inline IPS Mode has been a huge disappointment to me. My ifconfig igb0 yields the following settings: This message shows up every time I make a change to a Snort interface. Follow the steps in the Netgate documentation here to disable hardware VLAN filtering." "NOTICE: When using Inline IPS Mode with VLAN interfaces, hardware-level VLAN filtering should be disabled with most network cards. You don't feel that disabling VLAN_HWFILTER as suggested by the message below would help? I am not certain that this setting refers to hardware level VLAN filtering and if may actually refer to frame filtering as noted in the ifconfig man page.
Just to verify before changing back to LAN with legacy mode. But just be aware Suricata does not have the OpenAppID functionality if that is important to said in Snort on LAN stops all VLAN traffic: Your most expedient resolution is to either switch to Legacy Mode Blocking, or move over to Suricata and use it's "Block on DROPs Only" option. So if you are using VLANs, you are going to want those interfaces in Legacy Mode and not Inline IPS Mode. Also note that netmap and VLANs are, generally speaking, fundamentally incompatible with each other.
Netmap driver changes drivers#
My opinion is that FreeBSD-12's change to the iflib wrapper for NIC drivers has introduced weirdness with the netmap device. I don't think you are doing anything wrong.
When I attempt ifconfig igb0 -VLAN_HWFILTER from the command line as suggested when setting up Snort, I get a message indicating “bad value”. This occurs in spite of disabling flow control, normal MTU = 1500, and not having settings such as vlanhwtso when checking ifconfig.
Netmap driver changes how to#
The one thing I can’t figure out how to do is how to remove VLAN_HWFILTER from igb0 as I am repeatedly seeing messages like:Ġ96.746948 netmap_transmit igb0.# full hwcur 777 hwtail 895 qlen 905 Restart Snort after applying the change so it will see the new said in Snort on LAN stops all VLAN have had the same experience with the use of inline mode on LAN (igb0) and no immediate problems with inline mode on WAN, but have had some moderate problems with using inline mode on the VLANs themselves with what I think has been occasional loss of connectivity. Once you have a list created, go to the INTERFACE SETTINGS tab for the interface and down in the Pass List drop-down selector choose the list you created and save the change. You can add IP addresses or defined Aliases to the list when creating it. Be sure to keep the auto-selected defaults there. You would create one on the PASS LISTS tab. You whitelist hosts by adding them to a custom Pass List. It has an option when using Legacy Mode blocking called "Block on DROPs Only" that can be enabled. Suricata does, if you wanted to try that. No, Snort does not offer an analog to inline IPS mode. But where I can whitelist VOIP hosts, I don't know what to do with Ring. Is there a way to emulate in-line behavior - as in - alert only by default and block based on explicit rules or SID? By default it blocks too much and too quickly. Said in Snort on LAN stops all VLAN traffic:
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