Re: sendmail's outgoing IPs
i have 3 different links to ISP all are ADSL's so outgoing bandwidth is low, i would like to spread the load generated by outgoing mails. Pardon my lack of imagination, but how could anyone -- other than a spammer -- be generating enough outbound email traffic to *need* to load-balance it, and yet have little enough total Internet traffic to be using DSL rather than something oriented to commercial use (like a T1)? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
by outgoing mails. Pardon my lack of imagination, but how could anyone -- other than a spammer -- be generating enough outbound email traffic to *need* to load-balance it, and yet have little enough please come to poland and use polish telecom's 4Mbit/s ADSL connections. you won't ask why. no i'm not a spammer, but my users often send mails like 20-40MB sized. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
Pardon my lack of imagination, but how could anyone -- other than a spammer -- be generating enough outbound email traffic to *need* to load-balance it, and yet have little enough total Internet traffic to be using DSL rather than something oriented to commercial use (like a T1)? the reason is simple something like T1 here costs far too much to dedicate it just for mails. for the same price i can get four 4Mbit/s ADSL's (which i have now), that actually gives 4Mbit/s download speed, but only 512kbps upload. if you substract ACK's needed for 4Mbit/s download, little is left. my ipfw rules manages all this so web browsing works fine, but mail output is a problem now. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
On Sun, 15 Jun 2008 Wojciech Puchar [EMAIL PROTECTED] wrote: no i'm not a spammer, but my users often send mails like 20-40MB sized. [..] something like T1 here costs far too much to dedicate it just for mails. for the same price i can get four 4Mbit/s ADSL's (which i have now), that actually gives 4Mbit/s download speed, but only 512kbps upload. Lucky you. We have a 1500/256kbps link for up to 20 boxes, though there's talk of upgrading to (nominally) 8M/384kbps. if you substract ACK's needed for 4Mbit/s download, little is left. Slight exaggeration, though TCP downloads do need say 5-10% of download bandwidth upstream. Sure, as soon as you use all upload bandwidth (your mail example, torrents of course, youtube uploads etc) your download bandwidth is shot. Not to mention very soggy remote ssh access :) my ipfw rules manages all this so web browsing works fine, but mail output is a problem now. Why not add dummynet pipes and suitable rules to limit the outbound bandwidth for mail (or torrents, whatever's a problem) to a maximum of say 80% of upload, so for 512k set upload limit to maybe 400k, leaving plenty of room for TCP acks? So mail takes a bit longer to send .. You can get fancier with weighted queueing of course, I haven't tried. Works well here anyway, but we're not running a multilink connection. hth, Ian ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
something like T1 here costs far too much to dedicate it just for mails. for the same price i can get four 4Mbit/s ADSL's (which i have now), that actually gives 4Mbit/s download speed, but only 512kbps upload. Lucky you. We have a 1500/256kbps link for up to 20 boxes, though there's talk of upgrading to (nominally) 8M/384kbps. i have 300 users. and all works quite fast :) if you substract ACK's needed for 4Mbit/s download, little is left. Slight exaggeration, though TCP downloads do need say 5-10% of download count 10 as HTTP requests can be large. that's 400kbit/s from 512 available! bandwidth upstream. Sure, as soon as you use all upload bandwidth (your mail example, torrents of course, youtube uploads etc) your download ipfw rules make sure upload bandwidth isn't saturated. it's just a problem that few is left for something else is a problem now. Why not add dummynet pipes and suitable rules to limit the outbound bandwidth for mail (or torrents, whatever's a problem) to a maximum of say 80% of upload, so for 512k set upload limit to maybe 400k, leaving i am already doing this. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
Wojciech Puchar wrote: by outgoing mails. Pardon my lack of imagination, but how could anyone -- other than a spammer -- be generating enough outbound email traffic to *need* to load-balance it, and yet have little enough please come to poland and use polish telecom's 4Mbit/s ADSL connections. you won't ask why. no i'm not a spammer, but my users often send mails like 20-40MB sized. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] Aloha List, In Hawaii we have 3 Mbit DSL that is used for email and web sites. Works just fine in and out. ~Al Plant - Honolulu, Hawaii - Phone: 808-284-2740 + http://hawaiidakine.com + http://freebsdinfo.org + + http://aloha50.net - Supporting - FreeBSD 6.* - 7.* - 8.* + email: [EMAIL PROTECTED] All that's really worth doing is what we do for others.- Lewis Carrol ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
sendmail's outgoing IPs
is it possible to make sendmail choose it's outgoing IP when sending mail from list of four in random or round-robin way? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
Wojciech Puchar [EMAIL PROTECTED] wrote: is it possible to make sendmail choose it's outgoing IP when sending mail from list of four in random or round-robin way? What problem are you trying to solve? And this really is a question for the sendmail mailing list. :-) -- Sahil Tandon [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
Wojciech Puchar wrote: is it possible to make sendmail choose it's outgoing IP when sending mail from list of four in random or round-robin way? Not easily. sendmail(8) defaults to binding to all IPs on the machine (INADDR_ANY) and the IP it will use to send with will just be whatever would be the default from the routing table to reach the destination. You can control what interfaces sendmail will listen on by using the DAEMON_OPTIONS() macro in /etc/mail/$(hostname).mc and you can set what IP number the machine will use as the origin address using the CLIENT_OPTIONS() macro. However, CLIENT_OPTIONS() doesn't give you any method of cycling through multiple IP numbers. What could you do? Run four instances of sendmail in different jails as outgoing mail relays, each bound to a different IP. Supposing your server is called 'smtp.your.dom.ain' then you can make that an A record which returns those 4 different IP numbers. Clients looking the server up in the DNS will get a randomised list of IPs (or round-robin, depending on the configuration of the DNS servers you're using). Alternatively you can use one instance of sendmail and do NAT tricks to rewrite the packets on the way out of the firewall. See http://www.openbsd.org/faq/pf/nat.html and the 'NAT LOAD BALANCE' example in pf.conf(5). Note however that you should take care to ensure that the hostname your MTA helos as matches whatever IP or IPs are ultimately used in the connection to the other MTA, or your message may well be refused as likely to be spam. There are also recipes I've seen on the comp.mail.sendmail newsgroup for running sendmail with multiple virtual identities depending on the sender address of the e-mail, which isn't exactly what you asked for but might be good enough. Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW signature.asc Description: OpenPGP digital signature
Re: sendmail's outgoing IPs
from list of four in random or round-robin way? What problem are you trying to solve? And this really is a question for the i have 3 different links to ISP all are ADSL's so outgoing bandwidth is low, i would like to spread the load generated by outgoing mails. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sendmail's outgoing IPs
What could you do? Run four instances of sendmail in different jails as outgoing mail relays, each bound to a different IP. Supposing your that's what i was thinking about, but believed there is smarted method. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
