However I think this indicates that something odd is happening with NAT. I've tried the telnet trick to see if the WAN address answers on port 25 - it doesn't. I can work around this by adding the address to the SPF string, but the point is that this should not have happened: the email should have been seen to originate from the server at A.B.201.249 (I do not relay outgoing mail through my ISP's smarthost). Firstly, I happen to use SPF, and when I was sending an email to Yahoo (which checks SPF to make sure that the server sending a mail is permitted to do so for that domain), I got an error message refusing delivery because the email was send from the WAN address of the router, i.e. Ok, now the odd bit - actually two things. I've used "telnet A.B.201.249 25" to check that the SMTP server is visible from an external network. I've checked the iptables rules that this generates and they seem plausible. The SPI fw is enabled, and I have built a firewall rule set using Firewall Builder. It is acting as a DHCP server for the LAN, but I have fixed the address for the server as A.B.201.249. I have assigned a LAN address of A.B.201.241 to the router, and enabled SSH. I also pass protocol 41 traffic through to this server from one external IP address. On the LAN, I have a server at A.B.201.249, running SMTP, IMAP, DNS, HTTP, HTTPS, SSH, all of which I want to expose to the Internet. my end of the PPPoE tunnel, but under normal circumstances I would have no reason to use this address. There is also a single public address A.B.87.164, which is the WAN address for the router, i.e. I'm running DD-WRT v24SP2 VPN (not using the VPN part at the moment). I've replaced this with a Linksys WRT54GL (used with the same Vigor modem).
#DDWRT FIREWALL BUILDER KEVIN WORKAROUND SERIES#
I used to use a Cisco 800 series router to terminate a PPPoE connection, with a Draytek Vigor 100 ADSL modem. The SMTP server (Exim4) has been in use for 18 months in this configuration, and I haven't made any recent changes in its configuration. I have an odd problem using a server with SMTP behind a DD-WRT firewall, and I hope that someone can help. 97 of them, or 73.5%, are flagged for cleanup.Posted: Mon 22:54 Post subject: Odd problem with SMTP The project has 132 top-importance articles. 16 of them, or 37.2%, are flagged for cleanup.Īrticles with specifically-marked weasel-worded phrases (Feb 2010)Īrticles with specifically-marked weasel-worded phrases (Nov 2009, Jan 2010), Articles with unsourced statements (Sep 2009, Dec 2009, Mar 2010)Īrticles with unsourced statements (Jul 2008)Īrticles with unsourced statements (Apr 2009, Nov 2009)Īrticles with unsourced statements (May 2008, Jun 2008)Īrticles with dead external links (Mar 2010)Īrticles with obsolete information, Articles with unsourced statements (Oct 2009)Īrticles to be expanded (Jan 2009), Articles with unsourced statements (Dec 2008, Feb 2009, Sep 2009)Īrticles with unsourced statements (Feb 2010)Īrticles with unsourced statements (Nov 2009)Īrticles with unsourced statements (Oct 2009)Īrticles with dead external links (May 2009, Feb 2010), Articles with specifically-marked weasel-worded phrases (Feb 2010), Articles with unsourced statements (Nov 2009)Īrticles with dead external links (Nov 2008) 2 of them, or 66.7%, are flagged for cleanup.Īrticles with dead external links (Aug 2008), Articles with specifically-marked weasel-worded phrases (Dec 2009, Mar 2010)Īrticles with dead external links (Mar 2009, Jan 2010)
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