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

    SMTP over WANB? (Multi-WAN config)

    Scheduled Pinned Locked Moved NAT
    52 Posts 2 Posters 19.0k Views
    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.
    • P
      pfnewbe
      last edited by

      ???
      Getting crazy about this….

      1st I've created a new gateway:
      mailgw  LAN  192.168.2.16  192.168.2.16  route to mailgw 
      Then created new rule as you said.
      1st rule in LAN-tab is now:

      ID  Proto  Source  Port  Destination  Port  Gateway  Queue  Schedule  Description 
      TCP * * * 25 (SMTP) mailgw none   SMTP to mailgw
      And still no mail received on mailgw  :'(

      1 Reply Last reply Reply Quote 0
      • D
        danswartz
        last edited by

        Why did you create a new gateway?  Also, sorry, I made a typo.  The gateway in the LAN rule should be the WANB IP, not the internal SMTP server…

        1 Reply Last reply Reply Quote 0
        • P
          pfnewbe
          last edited by

          Because:

          Proto Src Port Dst Port Gateway      Queue Schedule
          TCP  *  *    *    25  192.168.2.16 None

          My 1st two rules on the LAN-tab are:

          Proto  Source      Port  Destination  Port        Gateway  Queue  Schedule  Description 
          TCP     *        *          *                 25 (SMTP) WANB none                   SMTP to mailgw

          • 192.168.2.16    *        *                      *         WANB none                   mailgw route via WANB

          In the firewall-log I see the SMTP's coming in but are not delivered to my mailgw (192.168.2.16 - I've checked it with a 'tcpdump -i eth0'):

          Act  Time  If  Source  Destination  Proto
          pass
          Aug 20 11:54:03 WANB 151.60.156.44:22285 [My ip]:25 TCP:S
          pass
          Aug 20 11:53:57 WANB 151.60.156.44:22221 [My ip]:25 TCP:S
          pass
          Aug 20 11:53:55 WANB 88.177.208.23:35421 [My ip]:25 TCP:S

          Any ideas?

          1 Reply Last reply Reply Quote 0
          • D
            danswartz
            last edited by

            that is inbound smtp - i thought that worked and we were trying to fix outbound smtp to use WANB?  I went back and re-read your OP and saw you don't receive either.  It is hard to tell what is wrong this way.  Can you post screen captures of the rules (inbound and outbound) and NAT (inbound and outbound.)

            1 Reply Last reply Reply Quote 0
            • P
              pfnewbe
              last edited by

              ;D
              Found my outbound problem on the mailserver….
              Outbount route for the mailgw was working, but was forgotten to change the def.gw and namesever of the mailserver.
              sorry.
              Outbound mail is working perfect.
              Now only inbound to mailgw to solve... (yes, def.gw. and nameservers are ok on mailgw  ;))

              1 Reply Last reply Reply Quote 0
              • D
                danswartz
                last edited by

                Still would like to see screenshot of portforward and permission rules.

                1 Reply Last reply Reply Quote 0
                • P
                  pfnewbe
                  last edited by

                  My outbound is working!
                  My inbound still doesn't work.

                  My only NAT-rule:

                  If  Proto  Src. addr  Src. ports  Dest. addr  Dest. ports  NAT IP  NAT Ports  Description 
                  WANB TCP * * WANB address 25 (SMTP) 192.168.2.16 25 (SMTP) NAT SMTP

                  All my WANB-rules:

                  ID  Proto  Source  Port  Destination  Port  Gateway  Queue  Schedule  Description 
                  UDP * * WANB address 1194 (OpenVPN) * none    
                  TCP * * 192.168.2.16 25 (SMTP) * none   NAT NAT SMTP

                  ![Screenshot-fw1.lan - Firewall: NAT: Port Forward - Mozilla Firefox.png](/public/imported_attachments/1/Screenshot-fw1.lan - Firewall: NAT: Port Forward - Mozilla Firefox.png)
                  ![Screenshot-fw1.lan - Firewall: NAT: Port Forward - Mozilla Firefox.png_thumb](/public/imported_attachments/1/Screenshot-fw1.lan - Firewall: NAT: Port Forward - Mozilla Firefox.png_thumb)

                  1 Reply Last reply Reply Quote 0
                  • P
                    pfnewbe
                    last edited by

                    This screenshot om my rules

                    ![Screenshot-fw1.lan - Firewall: Rules - Mozilla Firefox.png](/public/imported_attachments/1/Screenshot-fw1.lan - Firewall: Rules - Mozilla Firefox.png)
                    ![Screenshot-fw1.lan - Firewall: Rules - Mozilla Firefox.png_thumb](/public/imported_attachments/1/Screenshot-fw1.lan - Firewall: Rules - Mozilla Firefox.png_thumb)

                    1 Reply Last reply Reply Quote 0
                    • D
                      danswartz
                      last edited by

                      Hmmm, looks okay.  Are you sure the inbound smtp server has a default gateway pointing back to the pfsense?  If so, can you do a packet capture on the LAN interface while you try to connect from outside?

                      1 Reply Last reply Reply Quote 0
                      • P
                        pfnewbe
                        last edited by

                        Yup. Looks OK.

                        0.0.0.0        192.168.2.254  0.0.0.0        UG        0 0          0 eth0

                        1 Reply Last reply Reply Quote 0
                        • P
                          pfnewbe
                          last edited by

                          Hmmmmm… This looks interesting! I've put all logging on and see this.

                          block
                          Aug 23 22:34:51 LAN 192.168.2.16:25 65.55.34.215:43338 TCP:SA
                          […]
                           pass
                          Aug 23 22:33:17 WANB 65.55.34.215:43338 192.168.2.16:25 TCP:S

                          Look to the difference between the two timestamps.
                          What can be the cause of this?

                          [update]
                          My rules:
                            ID  Proto  Source  Port  Destination  Port  Gateway  Queue  Schedule  Description

                          • 192.168.2.14 * * * WANB none   mail route via WANB

                          • 192.168.2.16 * * * WANB none   mailgw route via WANB

                          • LAN net * * * * none   Default allow LAN to any rule

                          1 Reply Last reply Reply Quote 0
                          • D
                            danswartz
                            last edited by

                            that is odd for sure.  i am surprised you only see one SYN packet - if mailhost is not replying within a couple of seconds, we should have seen another.  instead of logging on the pfsense, please do a packet capture as i asked.

                            1 Reply Last reply Reply Quote 0
                            • P
                              pfnewbe
                              last edited by

                              LAN or WANB?

                              1 Reply Last reply Reply Quote 0
                              • D
                                danswartz
                                last edited by

                                LAN for starters.

                                1 Reply Last reply Reply Quote 0
                                • P
                                  pfnewbe
                                  last edited by

                                  lol….. wasn't able to upload here. I've send it to you mail.

                                  1 Reply Last reply Reply Quote 0
                                  • P
                                    pfnewbe
                                    last edited by

                                    with my old firewall works it okay!
                                    So, I cannot imagine that it is a problem on the 192.168.2.16

                                    1 Reply Last reply Reply Quote 0
                                    • D
                                      danswartz
                                      last edited by

                                      please don't email me things like that.  i didn't want an entire packet capture - tracing only inbound SMTP requests should have created a more manageable file.

                                      1 Reply Last reply Reply Quote 0
                                      • P
                                        pfnewbe
                                        last edited by

                                        Sorry. It was a capture of only port 25.
                                        What do I need to look for?

                                        1 Reply Last reply Reply Quote 0
                                        • D
                                          danswartz
                                          last edited by

                                          Can you do a numeric one instead?  This was on the LAN?

                                          1 Reply Last reply Reply Quote 0
                                          • P
                                            pfnewbe
                                            last edited by

                                            Yup. This was on LAN.

                                            Here's another one in numeric.

                                            23:43:18.825387 IP 65.55.34.203.19470 > 192.168.2.16.smtp: S 3691429999:3691429999(0) win 65535 <mss 1452,nop,nop,sackok="">23:43:18.825445 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:43:21.747190 IP 65.55.34.203.19470 > 192.168.2.16.smtp: S 3691429999:3691429999(0) win 65535 <mss 1452,nop,nop,sackok="">23:43:21.747222 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:43:23.358357 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:43:27.765613 IP 65.55.34.203.19470 > 192.168.2.16.smtp: S 3691429999:3691429999(0) win 65535 <mss 1452,nop,nop,sackok="">23:43:27.765646 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:43:29.358662 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:43:41.359231 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:43:43.759388 IP 192.168.2.16.smtp > 212.61.26.38.sdo-tls: S 3698667821:3698667821(0) ack 1312522795 win 5792 <mss 6="" 25655941="" 1460,nop,nop,timestamp="" 1212769185,nop,wscale="">23:44:05.570420 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">23:44:53.782771 IP 192.168.2.16.smtp > 65.55.34.203.19470: S 3797698790:3797698790(0) ack 3691430000 win 5840 <mss 1460,nop,nop,sackok="">Firewall log says:

                                            block
                                            Aug 23 23:42:47 LAN 192.168.2.16:25 65.55.34.203:19470 TCP:SA

                                            pass
                                            Aug 23 23:41:11 WANB 65.55.34.203:19470 192.168.2.16:25 TCP:S</mss></mss></mss></mss></mss></mss></mss></mss></mss></mss></mss></mss>

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