Hi,
I am seeing some behaviour I dont think I should on AIX with ipfilter 4.1.13.
All outgoing DNS requests are getting blocked and this is what ipmon shows:
Feb 21 00:10:31 sebotp520-1 local0:warn|warning ipmon[254018]: 01:00: 00.000000
en5 @0:3 b xxx.xxx.100.234,34002 -> xxx.xxx.166.18,53 PR udp len 20 73 OUT
# ipfstat -nio
@1 block out log all
@2 pass out quick on en5 proto udp from any to any keep state keep frags
@3 pass out quick on en5 proto udp from any to any port = domain keep
state keep frags
Why is it blocking on a pass rule, because of missing state?
Allowing port 53 stateless lets the packets through.
Looking at the ipfstat output shows alot of state (out) lost packets. Should
this really be, I dont see that at my fbsd/ipfilfter at home?
Some cut-n-paste info below.
I will look into this deeper tomorrow evening but any pointers would be
appreciated.
-km
# ipf -V
ipf: IP Filter: v4.1.13 (480)
Kernel: IP Filter: v4.1.13
Running: yes
Log Flags: 0 = none set
Default: pass all, Logging: available
Active list: 0
Feature mask: 0x87
# uname -a
AIX sebotp520-1 3 5 0008FAE6D700
# oslevel -s
5300-06-03-0732
# ipfstat -sl
...
sebotp520-1 -> xxx.xxx.166.18 pass 0x40004702 pr 17 state 0/0 bkt 85
tag 0 ttl 24 32872 -> 53
forward: pkts in 0 bytes in 0 pkts out 2 bytes out 125
backward: pkts in 2 bytes in 125 pkts out 0 bytes out 0
pass out quick keep frags keep state IPv4
pkt_flags & 0(0) = 0, pkt_options & ffffffff = 0, ffffffff = 0
pkt_security & ffff = 0, pkt_auth & ffff = 0
is_flx 0 0x1 0x1 0
interfaces: in -[],en5[en5] out en5[en5],-[]
Sync status: not synchronized
...
# ipfstat -s
IP states added:
910 TCP
1199 UDP
8 ICMP
17498769 hits
9872 misses
0 maximum
0 no memory
79 bkts in use
1002 active
0 expired
11 closed
State logging enabled
State table bucket statistics:
79 in use
62.20% bucket usage
0 minimal length
14 maximal length
12.684 average length
# ipfstat
bad packets: in 0 out 0
input packets: blocked 5435 passed 11500856 nomatch 0 counted 0 short 0
output packets: blocked 5229 passed 6003187 nomatch 0 counted 0 short 0
input packets logged: blocked 4946 passed 0
output packets logged: blocked 5186 passed 0
packets logged: input 0 output 0
log failures: input 3705 output 4786
fragment state(in): kept 0 lost 0 not fragmented 0
fragment state(out): kept 0 lost 0 not fragmented 0
packet state(in): kept 319 lost 592
packet state(out): kept 798 lost 9589
ICMP replies: 0 TCP RSTs sent: 0
Invalid source(in): 0
Result cache hits(in): 1852 (out): 178
IN Pullups succeeded: 0 failed: 0
OUT Pullups succeeded: 0 failed: 0
Fastroute successes: 0 failures: 0
TCP cksum fails(in): 0 (out): 0
IPF Ticks: 0
Packet log flags set: (0)
none
