On deleting the gw for the internal interface, My Public interfaces work fine. But I cannot get to the internal network.
You may wonder why am using two public interfaces. I have services running on that machine and using I.P based virtual hosting. I therefore need those two interfaces. On Wed, Feb 23, 2011 at 1:16 PM, David Gelvin <[email protected]>wrote: > sudo route del default gw 172.16.0.1 > > > On Wed, Feb 23, 2011 at 12:08 PM, Richard Zulu <[email protected]> wrote: > >> Hi, >> >> This is being done on a linux PC with three interfaces.* Ignore interface >> eth0.* The linux PC connects to a switch that connects it to the rest of >> my network.. *Eth1 and eth1:1* is are external facing interfaces with >> public I.Ps. Eth3 is facing my internal network with a private I.P address. >> >> The *problem* is: When the internal interface (eth3) is up, I cannot >> reach the rest of my public network from eth1:1 and cannot reach the >> internal network too using eth3. >> >> However, with the internal interface down, eth3 in this case, I can reach >> the rest of my network from both interfaces eth1 and eth1:1 >> >> How can I keep both my external interfaces and internal interface up and >> still be able to reach the rest of the network (External network) and my >> internal hosts (that use private I.Ps) too? >> >> >> >> The output of route -n >> >> Destination Gateway Genmask Flags Metric Ref Use >> Iface >> 196.43.133.64 0.0.0.0 255.255.255.192 U 0 0 >> 0 eth1 >> 192.168.2.0 0.0.0.0 255.255.255.0 U 0 >> 0 0 eth0 >> 172.16.0.0 0.0.0.0 255.255.0.0 U 0 >> 0 0 eth3 >> 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 >> 0 0 eth0 >> 0.0.0.0 172.16.0.1 0.0.0.0 UG 100 >> 0 0 eth3 >> 0.0.0.0 196.43.133.65 0.0.0.0 UG 100 >> 0 0 eth1 >> 0.0.0.0 192.168.2.1 0.0.0.0 UG 100 >> 0 0 eth0 >> >> My Interfaces are configured as below: >> >> eth1 Link encap:Ethernet HWaddr 00:e0:81:2b:0a:c3 >> inet addr:196.43.133.106 Bcast:196.43.133.127 >> Mask:255.255.255.192 >> inet6 addr: fe80::2e0:81ff:fe2b:ac3/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:1354 errors:0 dropped:900846 overruns:0 frame:0 >> TX packets:1254 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:1000 >> RX bytes:137539 (137.5 KB) TX bytes:133686 (133.6 KB) >> Interrupt:25 >> >> eth1:1 Link encap:Ethernet HWaddr 00:e0:81:2b:0a:c3 >> inet addr:196.43.133.109 Bcast:196.43.133.127 >> Mask:255.255.255.192 >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> Interrupt:25 >> >> eth3 Link encap:Ethernet HWaddr 00:04:23:08:91:dd >> inet addr:172.16.0.10 Bcast:172.16.255.255 Mask:255.255.0.0 >> inet6 addr: fe80::204:23ff:fe08:91dd/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:12439091 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:629185 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:100 >> RX bytes:1006167150 (1.0 GB) TX bytes:60553805 (60.5 MB) >> >> Is that clear enough? :) >> >> >> >> >> >> >> On Tue, Feb 22, 2011 at 4:39 PM, Simon Vass <[email protected]> wrote: >> >>> Are you trying to build a firewall? Is this on a device or a PC? >>> >>> >>> >>> Simon Vass >>> Managing Director >>> E-Tech Uganda Ltd >>> >>> http://www.etech.ug >>> Tel: +256 (0) 312260620 or (0) 312260621 >>> email: [email protected] >>> skype: e-techservicedesk >>> >>> >>> ----- Original Message ----- >>> From: "Richard Zulu" <[email protected]> >>> To: "Uganda Linux User Group" <[email protected]> >>> Sent: Tuesday, 22 February, 2011 1:19:37 PM >>> Subject: [LUG] IP Routing Multiple interfaces >>> >>> >>> 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. >>> >>> -- >>> This message has been scanned for viruses and >>> dangerous content by MailScanner, and is >>> believed to be clean. >>> >>> _______________________________________________ >>> 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. >> > > > _______________________________________________ > 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.
