Netgate Discussion Forum
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Search
    • Register
    • Login

    Alias firewall block rule not blocked!

    Firewalling
    5
    56
    6.1k
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • DerelictD
      Derelict LAYER 8 Netgate
      last edited by

      If the IP address was in the alias and there was no active state it would have been blocked.

      If something else was the result then there was a reason for it. Finding that reason is the trick.

      When you have an active state you can use pfctl to find which rule passed the connection should you desire to dig that deep. If I had traffic I thought should be blocked that wasn't, I would want to know why.

      Chattanooga, Tennessee, USA
      A comprehensive network diagram is worth 10,000 words and 15 conference calls.
      DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
      Do Not Chat For Help! NO_WAN_EGRESS(TM)

      1 Reply Last reply Reply Quote 0
      • M
        mrsunfire
        last edited by

        There should be no active state after a reboot. I now did the same as before and now the IP gets blocked. If I could simulate that error again, I would do that.

        Netgate 6100 MAX

        1 Reply Last reply Reply Quote 0
        • DerelictD
          Derelict LAYER 8 Netgate
          last edited by

          It was user error. You did not find a bug in pf that passed blocked traffic.

          Chattanooga, Tennessee, USA
          A comprehensive network diagram is worth 10,000 words and 15 conference calls.
          DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
          Do Not Chat For Help! NO_WAN_EGRESS(TM)

          1 Reply Last reply Reply Quote 0
          • M
            mrsunfire
            last edited by

            Then how do you explain from my first screen that the alias is on top and the .17 IP is on 3th line of rules. But that one blocks the traffic and the alias did not?

            Netgate 6100 MAX

            1 Reply Last reply Reply Quote 0
            • DerelictD
              Derelict LAYER 8 Netgate
              last edited by

              User error. Not understanding what you are looking at. State established before the rule was in place. Some other rule passing the traffic.

              Chattanooga, Tennessee, USA
              A comprehensive network diagram is worth 10,000 words and 15 conference calls.
              DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
              Do Not Chat For Help! NO_WAN_EGRESS(TM)

              1 Reply Last reply Reply Quote 0
              • M
                mrsunfire
                last edited by

                So the state stays established even after a reboot? I can't believe that...

                Netgate 6100 MAX

                1 Reply Last reply Reply Quote 0
                • DerelictD
                  Derelict LAYER 8 Netgate
                  last edited by

                  No. The state was re-established after you rebooted because a firewall rule passed the traffic.

                  Chattanooga, Tennessee, USA
                  A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                  DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                  Do Not Chat For Help! NO_WAN_EGRESS(TM)

                  1 Reply Last reply Reply Quote 0
                  • M
                    mrsunfire
                    last edited by

                    I restored the firewall rules to an earlier date and rebooted the machine. The alias is still the same and now the .17 again gets access. How to find out what rule is the problem?pf1.jpg

                    Netgate 6100 MAX

                    1 Reply Last reply Reply Quote 0
                    • DerelictD
                      Derelict LAYER 8 Netgate
                      last edited by

                      pfctl -vvss | grep -A3 192.168.1.17

                      Find the state you think should not be there out of that. Post it.

                      Chattanooga, Tennessee, USA
                      A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                      DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                      Do Not Chat For Help! NO_WAN_EGRESS(TM)

                      1 Reply Last reply Reply Quote 0
                      • M
                        mrsunfire
                        last edited by

                        @Derelict said in Alias firewall block rule not blocked!:

                        pfctl -vvss | grep -A3 192.168.1.17

                        igb4 udp 192.168.1.1:53 <- 192.168.1.17:50872       NO_TRAFFIC:SINGLE
   age 00:00:55, expires in 00:00:05, 1:0 pkts, 56:0 bytes, rule 164
   id: 010000005cd28985 creatorid: 3dddfb2a
igb4 udp 192.168.1.255:32414 <- 192.168.1.10:55418       NO_TRAFFIC:SINGLE
--
igb4 udp 192.168.1.1:53 <- 192.168.1.17:43906       NO_TRAFFIC:SINGLE
   age 00:00:55, expires in 00:00:05, 1:0 pkts, 59:0 bytes, rule 164
   id: 010000005cd28988 creatorid: 3dddfb2a
igb5 ipv6-icmp ff02::1[192] <- fe80::201:5cff:fe6b:e046[192]       NO_TRAFFIC:NO_TRAFFIC
--
igb4 udp 114.55.218.176:32100 <- 192.168.1.17:27288       NO_TRAFFIC:SINGLE
   age 00:00:48, expires in 00:00:12, 1:0 pkts, 32:0 bytes, rule 178
   id: 010000005cd28a38 creatorid: 485eb46e
igb4 udp 47.91.90.222:32100 <- 192.168.1.17:27288       NO_TRAFFIC:SINGLE
   age 00:00:48, expires in 00:00:12, 1:0 pkts, 32:0 bytes, rule 178
   id: 010000005cd28a39 creatorid: 485eb46e
igb4 udp 192.168.1.1:161 <- 192.168.1.10:56756       MULTIPLE:MULTIPLE
--
igb4 udp 107.20.134.235:32100 <- 192.168.1.17:27288       NO_TRAFFIC:SINGLE
   age 00:00:48, expires in 00:00:12, 1:0 pkts, 32:0 bytes, rule 178
   id: 000000005cd28acc creatorid: 485eb46e
igb4.300 udp 8.8.8.8:53 <- 10.0.2.2:45009       NO_TRAFFIC:SINGLE
--
igb4 udp 192.168.1.1:53 <- 192.168.1.17:51499       SINGLE:MULTIPLE
   age 00:00:33, expires in 00:00:00, 1:1 pkts, 56:72 bytes, rule 181
   id: 000000005cd28c1a creatorid: b13ad8d2
igb5 udp 2a02:8071:800:0:527:2af9:a20f:552a[41679] -> 2001:8d8:fe:53:0:d9a0:52c2:100[53]       MULTIPLE:SINGLE
--
igb4 udp 107.20.134.235:32100 <- 192.168.1.17:25029       SINGLE:MULTIPLE
   age 00:00:33, expires in 00:00:00, 1:1 pkts, 32:48 bytes, rule 181
   id: 000000005cd28c1b creatorid: b13ad8d2
igb5 udp xxx:64148 -> 217.160.83.194:53       MULTIPLE:SINGLE
--
igb5 udp xxx:57526 (192.168.1.17:25029) -> 107.20.134.235:32100       MULTIPLE:SINGLE
   age 00:00:33, expires in 00:00:00, 1:1 pkts, 32:48 bytes, rule 141
   id: 000000005cd28c1c creatorid: b13ad8d2
igb5 udp 2a02:8071:800:0:527:2af9:a20f:552a[45428] -> 2001:503:e239::3:2[53]       MULTIPLE:SINGLE
--
igb4 udp 192.168.1.1:53 <- 192.168.1.17:35486       SINGLE:MULTIPLE
   age 00:00:33, expires in 00:00:00, 1:1 pkts, 61:77 bytes, rule 181
   id: 010000005cd28c21 creatorid: b13ad8d2
igb4 udp 107.20.134.235:32100 <- 192.168.1.18:10092       MULTIPLE:MULTIPLE
--
igb4 udp 114.55.218.176:32100 <- 192.168.1.17:25029       NO_TRAFFIC:SINGLE
   age 00:00:33, expires in 00:00:27, 1:0 pkts, 32:0 bytes, rule 181
   id: 010000005cd28c22 creatorid: b13ad8d2
igb5 udp xxx:41955 (192.168.1.18:10092) -> 107.20.134.235:32100       MULTIPLE:MULTIPLE
--
igb5 udp xxx:10147 (192.168.1.17:25029) -> 114.55.218.176:32100       SINGLE:NO_TRAFFIC
   age 00:00:33, expires in 00:00:27, 1:0 pkts, 32:0 bytes, rule 141
   id: 010000005cd28c23 creatorid: b13ad8d2
igb4 udp 2a02:8071:889:c500:4262:31ff:fe07:2bdc[53] <- 2a02:8071:889:c500:f525:878c:30fa:1bb5[50603]       SINGLE:MULTIPLE
--
igb4 udp 47.91.90.222:32100 <- 192.168.1.17:25029       SINGLE:MULTIPLE
   age 00:00:33, expires in 00:00:00, 1:1 pkts, 32:48 bytes, rule 181
   id: 010000005cd28c24 creatorid: b13ad8d2
igb4 udp 192.168.1.1:53 <- 192.168.1.122:53655       SINGLE:MULTIPLE
--
igb5 udp xxx:51011 (192.168.1.17:25029) -> 47.91.90.222:32100       MULTIPLE:SINGLE
   age 00:00:33, expires in 00:00:00, 1:1 pkts, 32:48 bytes, rule 141
   id: 010000005cd28c25 creatorid: b13ad8d2
igb4 udp 114.55.218.176:32100 <- 192.168.1.18:21763       NO_TRAFFIC:SINGLE

                        Netgate 6100 MAX

                        DerelictD 1 Reply Last reply Reply Quote 0
                        • DerelictD
                          Derelict LAYER 8 Netgate @mrsunfire
                          last edited by

                          @mrsunfire OK, help me out. Which state should not be there?

                          Chattanooga, Tennessee, USA
                          A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                          DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                          Do Not Chat For Help! NO_WAN_EGRESS(TM)

                          1 Reply Last reply Reply Quote 0
                          • M
                            mrsunfire
                            last edited by

                            All of the igb5 (WAN) connections from or to the 192.168.1.17.

                            Netgate 6100 MAX

                            DerelictD 1 Reply Last reply Reply Quote 0
                            • DerelictD
                              Derelict LAYER 8 Netgate @mrsunfire
                              last edited by

                              @mrsunfire Pick one.

                              Chattanooga, Tennessee, USA
                              A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                              DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                              Do Not Chat For Help! NO_WAN_EGRESS(TM)

                              1 Reply Last reply Reply Quote 0
                              • M
                                mrsunfire
                                last edited by

                                @mrsunfire said in Alias firewall block rule not blocked!:

                                igb5 udp xxx:10147 (192.168.1.17:25029) -> 114.55.218.176:32100 SINGLE:NO_TRAFFIC
                                age 00:00:33, expires in 00:00:27, 1:0 pkts, 32:0 bytes, rule 141
                                id: 010000005cd28c23 creatorid: b13ad8d2

                                igb5 udp xxx:10147 (192.168.1.17:25029) -> 114.55.218.176:32100 SINGLE:NO_TRAFFIC
                                age 00:00:33, expires in 00:00:27, 1:0 pkts, 32:0 bytes, rule 141
                                id: 010000005cd28c23 creatorid: b13ad8d2

                                Netgate 6100 MAX

                                1 Reply Last reply Reply Quote 0
                                • DerelictD
                                  Derelict LAYER 8 Netgate
                                  last edited by

                                  @mrsunfire said in Alias firewall block rule not blocked!:

                                  pfctl -vvsr | grep -A3 '^@141('

                                  pfctl -vvsr | grep -A3 '^@181('

                                  Chattanooga, Tennessee, USA
                                  A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                                  DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                                  Do Not Chat For Help! NO_WAN_EGRESS(TM)

                                  1 Reply Last reply Reply Quote 0
                                  • M
                                    mrsunfire
                                    last edited by mrsunfire

                                    @Derelict said in Alias firewall block rule not blocked!:

                                    pfctl -vvsr | grep -A3 '^@141('

                                    @141(1000011161) pass out route-to (igb5 134.3.212.1) inet from xxx to ! 134.3.212.0/22 flags S/SA keep state allow-opts label "let out anything from firewall host itself"
  [ Evaluations: 1218      Packets: 12419     Bytes: 8152153     States: 167   ]
  [ Inserted: pid 49753 State Creations: 183   ]
@142(1000011162) pass out route-to (igb5 fe80::201:5cff:fe6b:e046) inet6 from 2a02:8071:xxx to ! 2a02:8071:xxx::/56 flags S/SA keep state allow-opts label "let out anything from firewall host itself"

                                    Netgate 6100 MAX

                                    1 Reply Last reply Reply Quote 0
                                    • DerelictD
                                      Derelict LAYER 8 Netgate
                                      last edited by

                                      [insert final jeopardy theme here.]

                                      Chattanooga, Tennessee, USA
                                      A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                                      DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                                      Do Not Chat For Help! NO_WAN_EGRESS(TM)

                                      1 Reply Last reply Reply Quote 0
                                      • M
                                        mrsunfire
                                        last edited by

                                        Right now the alias is working again and I can't get it to not work. I did nothing but now it is blocking. Sorry, I don't see the error there and will give it a try again in the future. Thanks for your help so far.

                                        Netgate 6100 MAX

                                        1 Reply Last reply Reply Quote 0
                                        • DerelictD
                                          Derelict LAYER 8 Netgate
                                          last edited by

                                          What was rule 181 in that rule set? Inquiring minds want to know!

                                          Chattanooga, Tennessee, USA
                                          A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                                          DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                                          Do Not Chat For Help! NO_WAN_EGRESS(TM)

                                          1 Reply Last reply Reply Quote 0
                                          • M
                                            mrsunfire
                                            last edited by mrsunfire

                                            This is a rule that passed the traffic from one client on LAN to my Cable Modem interface:

                                            @181(1526110841) pass in quick on igb4 route-to (igb5 134.3.212.1) inet from 192.168.1.20 to 192.168.100.1 flags S/SA keep state label "USER_RULE: PC TC4400 Modem"
  [ Evaluations: 1048      Packets: 0         Bytes: 0           States: 0     ]
  [ Inserted: pid 79204 State Creations: 0     ]
@182(1417115627) pass in quick on igb4 inet from 192.168.1.0/24 to any flags S/SA keep state label "USER_RULE: Allow ALL IPv4"

                                            Netgate 6100 MAX

                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post
                                            Copyright 2025 Rubicon Communications LLC (Netgate). All rights reserved.