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Re: PF Problems


Thanks for responding.  I will start watching this.

I am using NAT with <100 hosts.  Most of the traffic is https.

NetBSD 4.0 amd64, 2 cpu, 1G memory

State Table                          Total             Rate
  current entries                     4410
  searches                         7162532          270.3/s
  inserts                           357457           13.5/s
  removals                          353047           13.3/s
  match                             364479           13.8/s
  bad-offset                             0            0.0/s
  fragment                               0            0.0/s
  short                                  0            0.0/s
  normalize                              0            0.0/s
  memory                                 0            0.0/s
  bad-timestamp                          0            0.0/s
  congestion                             0            0.0/s
  ip-option                              0            0.0/s
  proto-cksum                            0            0.0/s
  state-mismatch                      6407            0.2/s
  state-insert                           0            0.0/s
  state-limit                            0            0.0/s
  src-limit                              0            0.0/s
  synproxy                               0            0.0/s

tcp.first                   120s
tcp.opening                  30s
tcp.established           86400s
tcp.closing                 900s
tcp.finwait                  45s
tcp.closed                   90s
tcp.tsdiff                   30s
udp.first                    60s
udp.single                   30s
udp.multiple                 60s
icmp.first                   20s
icmp.error                   10s
other.first                  60s
other.single                 30s
other.multiple               60s
frag                         30s
interval                     10s
adaptive.start                0 states
adaptive.end                  0 states
src.track                     0s

states     hard limit  10000
src-nodes  hard limit  10000
frags      hard limit   5000

Patrick Welche wrote:
On Thu, Jul 16, 2009 at 09:32:55PM -0500, Steve Pribyl wrote:
I am using NetBSD 4.0 with Carp and pf.
The problem is pf works great for a while then starts to not work,
slow, refuses pings, forwarding, etc in a random way.

So, I need so suggestions on how to debug this or even if someone
has seen or heard of this before.

Roughly how many hosts have you got on your network? Are you using
network address translation?

Just guessing: many many connections all holding state, state table becomes
full so no more new connections allowed through. Some connection finishes,
so now there is room for a new one, so "randomly" works again...

pfctl -s all

Should show what is going on... My impression though is that defaults are
fine for hundreds of hosts, so check through your rules?



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