On 2018-01-30 14:08, jin&hitman&Barracuda wrote: > 2018-01-30 15:22 GMT+03:00 Bill Shirley <[email protected]>: > >> On the new Postfix server, are you using DHCP client on the WAN interface >> to get a IP address? You should not be. You should assign your public >> address >> to the WAN interface. >> >> I have static addresses with my ISP. My ISP's modem will hand out private >> addresses >> if I use DHCP client. I don't configure my server to use DHCP; I have it >> set up to >> use the public address. >> >> Bill > >> > > On 1/30/2018 4:03 AM, Matus UHLAR - fantomas wrote: > On 30.01.18 00:09, jin&hitman&Barracuda wrote: > In-Reply-To: > <caldev8cxn8fc5ej4zntielpokc-8fvozze6wt00b5qzpeqf...@mail.gmail.com> > References: > <caldev8f6dsgwbzsav21rtekxd69lgrnwvrd1tgkapyhufsx...@mail.gmail.com> > <CALdev8fMW22bRAnyDYsRbcqjAcNUitUUqB=wcef0-o7jgaq...@mail.gmail.com> > hell, how did you create this e-mail? it looks like reply to thread with > another 9 e-mails. (Plese send new post when asking new question) > > We are tring to move our mx server to another isp. They gave us an IP > address but there is some strange points. When i try to connect any mail > related port on that ip, it send my connection to our new postfix server. > this is expected, isn't it? > > There is a destination nat on it. It is strange becouse i can't see my > actual source ip. I tried with many different hosts and It looks like there > is a source nat and i saw same ip as my source ip wherever i try. > this is also expected, when you have server on network with private IPs. > > From new postfix server, when i try to reach any server on internet, i see > another ip address on the source ip field and it is fixed too. > > I believe there is a mistake. Could it be feasible two different ip for > incoming and outgoing on one mx server ? > it's apparently a mistake, but might not be a problem. the incoming IP and > outgoing IP don't need be the same, although it's > easier when they are. > > On 30 Jan 2018 12:56 a.m., "Kevin A. McGrail" <[email protected]> wrote: > With NAT it could definitely be possible. What's your machines local ip > address with ifconfig? Is it a reserved private address? > On 30.01.18 01:03, jin&hitman&Barracuda wrote: > It is 192.168.34.30/24 [1] > this is a private address, not visible in the internet. > > On 30 Jan 2018 3:43 a.m., "Paul" <[email protected]> wrote: > What is the source IP you see making connections to your new postfix server > ? > On 30.01.18 09:28, jin&hitman&Barracuda wrote: > It is 172.27.203.20 > this is also a private address and it should not appear in the public > internet. Should not be a problem between servers. > > If you see this IP when you connect to your postfix from the internet, > complain to your new ISP immediately. Connections from outside should not be > NATted. > > let's clear things up: > > - which IP do you have when mailing to the outside? > - which IP you have to connect from outside in order to get to your mail > server?
Hi Bill No, there is no DHCP. All I have is one interface and it's it has a fixed IP address (192.168.34.30) >From the information you provided it looks like problem is not fixable by you. It's ok to have private address configured on your server if it is properly translated upstream. Amazon does that. You have private IP configured on your machine but it is translated to the same public address for both incoming and outgoing connections. Talk to your ISP about this. Karol -- Karol Augustin [email protected] http://karolaugustin.pl/ +353 85 775 5312 Links: ------ [1] http://192.168.34.30/24
