Re: use smtp_bind_address or defer
Hi, Am 26.09.2009 04:37 schrieb Victor Duchovni: Not without source code changes: I thought that... Why does the address get de-configured? You should be able to bind it provided the interface is administratively up, even if it is not working. I've two DSL lines and use RP-PPPoE. The IP is static but I receive it using PPP (like DHCP) and if the DSL line is down, the pppX-device vanishes - that's why no process can bind to the ip. -- Best regards, Sven mailto:s...@clamav.net ClamAV, a GPL anti-virus toolkit http://www.clamav.net
Re: use smtp_bind_address or defer
Hi, Am 26.09.2009 15:04 schrieb Wietse Venema: Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? All reasonable TCP/IP stacks will automatically use the right source IP address when sending out mail over the dialup link or over the local network. I've two dial-up lines and no other internet-connection. But if the static-ip connection is down, the TCP/IP-STACK uses the other connection with a dynamic ip. With the smtp_bind_address I need to force postfix to use the static ip, instead of using the dynamic ip for sending. Using the dynamic IP has lots of disadvantages: Higher spam cores, bounces and so on. -- Best regards, Sven mailto:s...@clamav.net ClamAV, a GPL anti-virus toolkit http://www.clamav.net
Re: use smtp_bind_address or defer
Sven Strickroth: Hi, Am 26.09.2009 15:04 schrieb Wietse Venema: Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? All reasonable TCP/IP stacks will automatically use the right source IP address when sending out mail over the dialup link or over the local network. I've two dial-up lines and no other internet-connection. But if the static-ip connection is down, the TCP/IP-STACK uses the other connection with a dynamic ip. With the smtp_bind_address I need to force postfix to use the static ip, instead of using the dynamic ip for sending. OK, so you send out IP packets with your static IP source address out over the dynamic interface. How do the return packets from remote sites (with destination your source IP address) know that they have to travel via your dynamic interface? What routing arrangements have you made with your dynamic provider to make that work? Wietse Using the dynamic IP has lots of disadvantages: Higher spam cores, bounces and so on. -- Best regards, Sven mailto:s...@clamav.net ClamAV, a GPL anti-virus toolkit http://www.clamav.net
Re: use smtp_bind_address or defer
Sven Strickroth: Hi, I've a server with multiple ip addresses (all dial-in). But only one static ip-address. So if the static ip line is down postfix prints out warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and uses the other (dynamic) ip for sending. Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? I never need to use smtp_bind_address when my own mailhost needs to fall back to dialup (which is fortunately rarely). All reasonable TCP/IP stacks will automatically use the right source IP address when sending out mail over the dialup link or over the local network. Wietse
Re: use smtp_bind_address or defer
Am 26.09.2009 16:18 schrieb Wietse Venema: OK, so you send out IP packets with your static IP source address out over the dynamic interface. no, and there's the problem. if the static-ip connection is down, postfix reports warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and then it binds to the dynamic ip and uses that. Why not add an option so that if the binding to the smtp_bind_address fails that postfix refuses to send mail. -- Best regards, Sven mailto:s...@clamav.net ClamAV, a GPL anti-virus toolkit http://www.clamav.net
Re: use smtp_bind_address or defer
On Sat, Sep 26, 2009 at 05:36:30PM +0200, Sven Strickroth wrote: Am 26.09.2009 16:18 schrieb Wietse Venema: OK, so you send out IP packets with your static IP source address out over the dynamic interface. no, and there's the problem. if the static-ip connection is down, postfix reports warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and then it binds to the dynamic ip and uses that. Why not add an option so that if the binding to the smtp_bind_address fails that postfix refuses to send mail. Add filters to block outbound port 25 on the dynamic interface. Pretend your ISP has already done that for you (as many do). -- Viktor. Disclaimer: off-list followups get on-list replies or get ignored. Please do not ignore the Reply-To header. To unsubscribe from the postfix-users list, visit http://www.postfix.org/lists.html or click the link below: mailto:majord...@postfix.org?body=unsubscribe%20postfix-users If my response solves your problem, the best way to thank me is to not send an it worked, thanks follow-up. If you must respond, please put It worked, thanks in the Subject so I can delete these quickly.
Re: use smtp_bind_address or defer
Victor Duchovni put forth on 9/26/2009 1:36 PM: On Sat, Sep 26, 2009 at 05:36:30PM +0200, Sven Strickroth wrote: Am 26.09.2009 16:18 schrieb Wietse Venema: OK, so you send out IP packets with your static IP source address out over the dynamic interface. no, and there's the problem. if the static-ip connection is down, postfix reports warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and then it binds to the dynamic ip and uses that. Why not add an option so that if the binding to the smtp_bind_address fails that postfix refuses to send mail. Add filters to block outbound port 25 on the dynamic interface. Pretend your ISP has already done that for you (as many do). Or... Might it be possible, via transport_maps or something, to relay via SASL auth to your dynamic IP DSL provider's submission/outbound SMTP relay server, either on TCP 25 or 587 (whichever they support), whenever your static IP interface is down? This will definitely help to mitigate some delivery issues you mentioned WRT receivers' anti spam measures. I ran this way for almost 4 years on an SBC/ATT PPPoE dynamic IP DSL connection with great success, although it was a single line setup. -- Stan
Re: use smtp_bind_address or defer
Stan Hoeppner: Victor Duchovni put forth on 9/26/2009 1:36 PM: On Sat, Sep 26, 2009 at 05:36:30PM +0200, Sven Strickroth wrote: Am 26.09.2009 16:18 schrieb Wietse Venema: OK, so you send out IP packets with your static IP source address out over the dynamic interface. no, and there's the problem. if the static-ip connection is down, postfix reports warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and then it binds to the dynamic ip and uses that. Why not add an option so that if the binding to the smtp_bind_address fails that postfix refuses to send mail. Add filters to block outbound port 25 on the dynamic interface. Pretend your ISP has already done that for you (as many do). Or... Might it be possible, via transport_maps or something, to relay via SASL auth to your dynamic IP DSL provider's submission/outbound SMTP relay server, either on TCP 25 or 587 (whichever they support), whenever your static IP interface is down? This will definitely help to mitigate some delivery issues you mentioned WRT receivers' anti spam measures. I ran this way for almost 4 years on an SBC/ATT PPPoE dynamic IP DSL connection with great success, although it was a single line setup. Postfix supports smtp_fallback_relay (set it to the dynamic ISP); and Postfix SASL passwords are always tied to specific SMTP servers. Wietse
use smtp_bind_address or defer
Hi, I've a server with multiple ip addresses (all dial-in). But only one static ip-address. So if the static ip line is down postfix prints out warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and uses the other (dynamic) ip for sending. Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? -- Best regards, Sven mailto:s...@clamav.net ClamAV, a GPL anti-virus toolkit http://www.clamav.net
Re: use smtp_bind_address or defer
Sven Strickroth put forth on 9/25/2009 7:43 PM: Hi, I've a server with multiple ip addresses (all dial-in). But only one static ip-address. So if the static ip line is down postfix prints out warning: smtp_connect_addr: bind x.x.x.x: Cannot assign requested address and uses the other (dynamic) ip for sending. Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? http://www.postfix.org/postconf.5.html#smtp_bind_address smtp_bind_address (default: empty) An optional numerical network address that the Postfix SMTP client should bind to when making an IPv4 connection. This can be specified in the main.cf file for all SMTP clients, or it can be specified in the master.cf file for a specific client, for example: /etc/postfix/master.cf: smtp ... smtp -o smtp_bind_address=11.22.33.44 Note 1: when inet_interfaces specifies no more than one IPv4 address, and that address is a non-loopback address, it is automatically used as the smtp_bind_address. This supports virtual IP hosting, but can be a problem on multi-homed firewalls. See the inet_interfaces documentation for more detail. Note 2: address information may be enclosed inside [], but this form is not required here.
Re: use smtp_bind_address or defer
Am 26.09.2009 03:40 schrieb Stan Hoeppner: Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? http://www.postfix.org/postconf.5.html#smtp_bind_address You only pasted the docs here, but my problem isn't described there (or I don't get it). My system is configured so that it correctly uses the smtp_bind_address, but when the specified smtp_bind_address is not available postfix binds to some other ip to send mail (instead of keeping it until the ip is available again). -- Best regards, Sven mailto:s...@clamav.net ClamAV, a GPL anti-virus toolkit http://www.clamav.net
Re: use smtp_bind_address or defer
Sven Strickroth put forth on 9/25/2009 8:49 PM: Am 26.09.2009 03:40 schrieb Stan Hoeppner: Is it possible to tell postfix not to send mails if the smtp_bind_address is not available? http://www.postfix.org/postconf.5.html#smtp_bind_address You only pasted the docs here, but my problem isn't described there (or I don't get it). My system is configured so that it correctly uses the smtp_bind_address, but when the specified smtp_bind_address is not available postfix binds to some other ip to send mail (instead of keeping it until the ip is available again). Provide 'postconf -d' output please. -- Stan
Re: use smtp_bind_address or defer
On 25-Sep-2009, at 20:35, Stan Hoeppner wrote: Provide 'postconf -d' output please. How is that going to help? from man postfconf: -d Print default parameter settings instead of actual settings. -- Master, what is the difference between a humanistic, monastic system of belief in which wisdom is sought by means of an apparently nonsensical system of questions and answers, and a lot of mystic gibberish made up on the spur of the moment? Wen considered this for some time, and a last said: A fish!
Re: use smtp_bind_address or defer
Victor Duchovni put forth on 9/25/2009 9:37 PM: Why does the address get de-configured? You should be able to bind it provided the interface is administratively up, even if it is not working. Ahh, that's the part I missed. Sounds like his flavor of *nix (and/or a driver) is automatically de-configuring the interface upon link failure/call hang-up/etc. Sven, are you using a multi-line ISDN or analog dial card? Or separate modems (serial or USB)? Or, is this actually a multi-line aDSL/cable setup, with the physical server connections being ethernet? You said all dial-in but some folks use dial-in interchangeably with dynamic IP aDSL/cable. I'm just trying to get on the exact same page so we can help you solve this. -- Stan
