[lvs-users] about NAT return path

support at remsnet.de support at remsnet.de
Sun Feb 22 09:01:07 GMT 2015

Hello Yonghua Peng,

AS per  LVS-NAT concept the realservers are allmost at an second network( rfc1912 ipaddresses allmost ):

haveing i.e net on lb1  at eth0
haveing i.e net on lb1  at eth1

external VIP i.e :

haveing i.e net on lb1  at eth1
haveing i.e net on lb2  at eth1

and the VI_GATEWAY on eth1  with i.e :

VI_GATEWAY are  managed by ldirectord or keepalived or other HA IPVS app.
VI_GATEWAY  with keepalived  managed by vrrp

keealive docu : http://www.keepalived.org/LVS-NAT-Keepalived-HOWTO.html

Make shure implement nonlocalbinds sys-ctl on realservers.
make shure implement ip forward and nonlocalbinds on LB´s

AS per  LVS-DR concept the realservers can be in the same or different networks and not require any NAT
LVS DR uses the standard default gw allmost  with rarp

see http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html

Mit freundlichen Grüßen / Best Regards

Horst Venzke ; PGP NET : 1024G/082F2E6D ;  http://www.remsnet.de

Legal Notice: This transmittal and/or attachments may be privileged or confidential. It is intended solely for the addressee named above. Any review, dissemination, or copying is strictly prohibited. If you received this transmittal in error, please notify us immediately by reply and immediately delete this message and all its attachments. Thank you.

> Gesendet: Montag, 02. Februar 2015 um 11:42 Uhr
> Von: "Yonghua Peng" <yhpeng at orange.fr>
> An: lvs-users at linuxvirtualserver.org
> Betreff: Re: [lvs-users] about NAT return path
> Hi,
> So, since LVS (NAT mode) implement SNAT for the returned packages, and 
> all LVS hosts have the same VIP, and all LVS hosts have been configured 
> with the same rules, now for the realserver, it can pickup any one of 
> the LVS hosts as its default gw. Am I right?
> Regards.
> Martin Wheldon wrote:
> > The SNAT could be configured on either the LVS node or the real server.
> >
> > Best Regards
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
> LinuxVirtualServer.org mailing list - lvs-users at LinuxVirtualServer.org
> Send requests to lvs-users-request at LinuxVirtualServer.org
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
-------------- next part --------------
A non-text attachment was scrubbed...
Name: addressbook.vcf
Type: text/x-vcard
Size: 929 bytes
Desc: not available
Url : http://lists.graemef.net/pipermail/lvs-users/attachments/20150222/b51d4e0b/attachment.vcf 

More information about the lvs-users mailing list