You can only have one default route statement in any network setup. This is the route
0.0.0.0/0 --> interface / gateway IP. If you have 2 such lines in your route table your network will fail almost every time both interfaces that 0.0.0.0/0 point to become active. The reason i say almost is because you can use route metrics or preference to specify which default route is currently active and which one is on standby incase the other goes down. I use this technique to provide seamless ISP failover for clients. On Wed, Feb 23, 2011 at 3:19 AM, Richard Zulu <[email protected]> wrote: > Well, > > The internal interface has a private I.P address, with a default gateway of > something like 172.16.0.1 and a subnet of /16 > > The external interfaces have Public I.Ps, with their default gateway having > public I.P. > > @Collins, with the internal interface up, the internal interface has it's > default route pointing to it's default gateway, 172.16.0.1 > > And the external interfaces also points to their own default gateway. > > > > On Wed, Feb 23, 2011 at 2:52 AM, sanga collins <[email protected]>wrote: > >> what is your default route when the internal interface is up? >> >> On Tue, Feb 22, 2011 at 5:19 AM, Richard Zulu <[email protected]> wrote: >> >>> Hi, >>> >>> Quick question: I have a linux box with three interfaces, two of them >>> face my external network (one is a sub-interface) , with the same gateway >>> address but obviously different I.Ps. Both are in the same public network / >>> subnet >>> >>> One of the interfaces faces my internal network, private IP addresses. >>> >>> Problem: With all the interfaces up, I cannot reach any of the networks, >>> both internal and external. >>> >>> However, with the internal network interface down, I can get to the >>> external network. >>> >>> I need my internal interface up so that I can get to my internal network >>> and at the same time get to the external networks. >>> >>> How can I pull it off? >>> >>> >>> >>> -- >>> Richard Zulu >>> gtug lead, Kampala (Uganda) >>> http://kampala.gtugs.org >>> >>> >>> >>> _______________________________________________ >>> The Uganda Linux User Group: http://linux.or.ug >>> >>> Send messages to this mailing list by addressing e-mails to: >>> [email protected] >>> Mailing list archives: http://www.mail-archive.com/[email protected]/ >>> Mailing list settings: http://kym.net/mailman/listinfo/lug >>> To unsubscribe: http://kym.net/mailman/options/lug >>> >>> The Uganda LUG mailing list is generously hosted by INFOCOM: >>> http://www.infocom.co.ug/ >>> >>> The above comments and data are owned by whoever posted them (including >>> attachments if any). The mailing list host is not responsible for them in >>> any way. >>> >> >> >> >> -- >> Sanga M. Collins >> Network Engineering >> ~~~~~~~~~~~~~~~~~~~~~~~ >> Google Voice: (954) 324-1365 >> E- fax: (435) 578 7411 >> >> _______________________________________________ >> The Uganda Linux User Group: http://linux.or.ug >> >> Send messages to this mailing list by addressing e-mails to: >> [email protected] >> Mailing list archives: http://www.mail-archive.com/[email protected]/ >> Mailing list settings: http://kym.net/mailman/listinfo/lug >> To unsubscribe: http://kym.net/mailman/options/lug >> >> The Uganda LUG mailing list is generously hosted by INFOCOM: >> http://www.infocom.co.ug/ >> >> The above comments and data are owned by whoever posted them (including >> attachments if any). The mailing list host is not responsible for them in >> any way. >> > > > > -- > Richard Zulu > gtug lead, Kampala (Uganda) > http://kampala.gtugs.org > > > > _______________________________________________ > The Uganda Linux User Group: http://linux.or.ug > > Send messages to this mailing list by addressing e-mails to: > [email protected] > Mailing list archives: http://www.mail-archive.com/[email protected]/ > Mailing list settings: http://kym.net/mailman/listinfo/lug > To unsubscribe: http://kym.net/mailman/options/lug > > The Uganda LUG mailing list is generously hosted by INFOCOM: > http://www.infocom.co.ug/ > > The above comments and data are owned by whoever posted them (including > attachments if any). The mailing list host is not responsible for them in > any way. > -- Sanga M. Collins Network Engineering ~~~~~~~~~~~~~~~~~~~~~~~ Google Voice: (954) 324-1365 E- fax: (435) 578 7411
_______________________________________________ The Uganda Linux User Group: http://linux.or.ug Send messages to this mailing list by addressing e-mails to: [email protected] Mailing list archives: http://www.mail-archive.com/[email protected]/ Mailing list settings: http://kym.net/mailman/listinfo/lug To unsubscribe: http://kym.net/mailman/options/lug The Uganda LUG mailing list is generously hosted by INFOCOM: http://www.infocom.co.ug/ The above comments and data are owned by whoever posted them (including attachments if any). The mailing list host is not responsible for them in any way.
