[LARTC] First Post: Question on Ip Aliasing
Hi All, I did a google search on this and didn't find exactly what I was looking for. Suppose I have a machine that has an IP alias eth0:0. I have set up HTB.init so that it properly throttles bandwidth on eth0, however when I use eth0:0, it doesn't work. I read elsewhere that it should work at the PHYSICAL device layer, and should therefore work for both at once. This is not happening though. Just wanted to find out if TC/iproute2/HTB will behave like that: Meaning, are they supposed to throttle bandwidth for the physical, AND the alias at the same time, or do I need a separate rule? Thanks in advance! P.S. I tried setting up eth0:0 as a config file in the HTB dir, and htb.init didn't like that at all. I wonder if TC would react the same way? ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: [LARTC] First Post: Question on Ip Aliasing
On Thursday, 08 April 2004, at 06:53:27 -0700, Discussion Lists wrote: I did a google search on this and didn't find exactly what I was looking for. Suppose I have a machine that has an IP alias eth0:0. I have set up HTB.init so that it properly throttles bandwidth on eth0, however when I use eth0:0, it doesn't work. I read elsewhere that it should work at the PHYSICAL device layer, and should therefore work for both at once. This is not happening though. Just wanted to find out if I think that the hack of alias interfaces in Linux has been one major source of conceptual problems with respect to Linux routing and the like in past years :-). I have always believed that it is much better to think of IP addresses in Linux as assigned to physical interfaces rather than associated to some kind of a virtual one. The ip address show command shows very clearly this fact. Each interface has zero or more IP addresses assigned to it, and with ip you will never see alias interfaces again, because this tool is modern enough to understand the fact. I encourage everyone to make the move to ip from old ifconfig and related tools as soon as possible. In the ip world you just have physical (or not so physical, like bond? or VLAN interfaces) interfaces and IP assigned to them. And when you want to refer to IP addresses, you just use them. And when you want to refer to interfaces, use the one you need. Also, have a look at the Stef Coene's excellent KPTD at: http://www.docum.org/stef.coene/qos/kptd/ Couple the above diagram with the previous explanation about IP and interfaces and maybe all will now be simpler to you. Greetings. -- Jose Luis Domingo Lopez Linux Registered User #189436 Debian Linux Sid (Linux 2.6.5) ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
RE: [LARTC] First Post: Question on Ip Aliasing
Thank you for your response. You confirmed what I understood to be how it works, but for some reason it isn't working like that, and I can't understand why. The alias gets assigned through heartbeat, during a failover, but traffic routes through that alias as if there was no shaping going on at all. In other words it just isn't working the way that it should be working. I am not even sure where to look for problems or errors. I don't see how my configuration can be wrong because it is shaping traffic just fine on the physical adapter . .. If anyone can think of other suggestions, I would greatly appreciate it. Thanks! -Original Message- From: Jose Luis Domingo Lopez [mailto:[EMAIL PROTECTED] Sent: Thursday, April 08, 2004 8:12 AM To: [EMAIL PROTECTED] Subject: Re: [LARTC] First Post: Question on Ip Aliasing On Thursday, 08 April 2004, at 06:53:27 -0700, Discussion Lists wrote: I did a google search on this and didn't find exactly what I was looking for. Suppose I have a machine that has an IP alias eth0:0. I have set up HTB.init so that it properly throttles bandwidth on eth0, however when I use eth0:0, it doesn't work. I read elsewhere that it should work at the PHYSICAL device layer, and should therefore work for both at once. This is not happening though. Just wanted to find out if I think that the hack of alias interfaces in Linux has been one major source of conceptual problems with respect to Linux routing and the like in past years :-). I have always believed that it is much better to think of IP addresses in Linux as assigned to physical interfaces rather than associated to some kind of a virtual one. The ip address show command shows very clearly this fact. Each interface has zero or more IP addresses assigned to it, and with ip you will never see alias interfaces again, because this tool is modern enough to understand the fact. I encourage everyone to make the move to ip from old ifconfig and related tools as soon as possible. In the ip world you just have physical (or not so physical, like bond? or VLAN interfaces) interfaces and IP assigned to them. And when you want to refer to IP addresses, you just use them. And when you want to refer to interfaces, use the one you need. Also, have a look at the Stef Coene's excellent KPTD at: http://www.docum.org/stef.coene/qos/kptd/ Couple the above diagram with the previous explanation about IP and interfaces and maybe all will now be simpler to you. Greetings. -- Jose Luis Domingo Lopez Linux Registered User #189436 Debian Linux Sid (Linux 2.6.5) ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
RE: [LARTC] First Post: Question on Ip Aliasing
Discussion Lists wrote: Thank you for your response. You confirmed what I understood to be how it works, but for some reason it isn't working like that, and I can't understand why. The alias gets assigned through heartbeat, during a failover, but traffic routes through that alias as if there was no shaping going on at all. In other words it just isn't working the way that it should be working. I am not even sure where to look for problems or errors. I don't see how my configuration can be wrong because it is shaping traffic just fine on the physical adapter . .. If anyone can think of other suggestions, I would greatly appreciate it. Do you run the trafficing script during a failover, or just when you boot the system? Maybe the traffic routing rules get dropped from the system once the interface is down, much the same way that routes do? Just a thought. I haven't bothered to setup traffic rules on my gateways yet. ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: [LARTC] First Post: Question on Ip Aliasing
nothing can go out through alias inetrface, alias is for input only. so everything is going through physical interface like eth0 if you are forwarding packets, then your interface ip is ignored anyway. (it is only used to translate ip to mac) if you want to shape localy generated trafic, then source ip will depend on what the user will chose, since he can use any aliased ip of your server. so simply ignore all virtual interaces imagine that you have none of them, - Original Message - From: Discussion Lists [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, April 08, 2004 11:59 PM Subject: RE: [LARTC] First Post: Question on Ip Aliasing Thank you for your response. You confirmed what I understood to be how it works, but for some reason it isn't working like that, and I can't understand why. The alias gets assigned through heartbeat, during a failover, but traffic routes through that alias as if there was no shaping going on at all. In other words it just isn't working the way that it should be working. I am not even sure where to look for problems or errors. I don't see how my configuration can be wrong because it is shaping traffic just fine on the physical adapter . .. If anyone can think of other suggestions, I would greatly appreciate it. Thanks! -Original Message- From: Jose Luis Domingo Lopez [mailto:[EMAIL PROTECTED] Sent: Thursday, April 08, 2004 8:12 AM To: [EMAIL PROTECTED] Subject: Re: [LARTC] First Post: Question on Ip Aliasing On Thursday, 08 April 2004, at 06:53:27 -0700, Discussion Lists wrote: I did a google search on this and didn't find exactly what I was looking for. Suppose I have a machine that has an IP alias eth0:0. I have set up HTB.init so that it properly throttles bandwidth on eth0, however when I use eth0:0, it doesn't work. I read elsewhere that it should work at the PHYSICAL device layer, and should therefore work for both at once. This is not happening though. Just wanted to find out if I think that the ''hack'' of ''alias interfaces'' in Linux has been one major source of conceptual problems with respect to Linux routing and the like in past years :-). I have always believed that it is much better to think of IP addresses in Linux as assigned to physical interfaces rather than associated to some kind of a virtual one. The ''ip address show'' command shows very clearly this fact. Each interface has zero or more IP addresses assigned to it, and with ''ip'' you will never see ''alias interfaces'' again, because this tool is modern enough to understand the fact. I encourage everyone to make the move to ''ip'' from old ''ifconfig'' and related tools as soon as possible. In the ''ip'' world you just have physical (or not so physical, like bond? or VLAN interfaces) interfaces and IP assigned to them. And when you want to refer to IP addresses, you just use them. And when you want to refer to interfaces, use the one you need. Also, have a look at the Stef Coene's excellent KPTD at: http://www.docum.org/stef.coene/qos/kptd/ Couple the above diagram with the previous explanation about IP and interfaces and maybe all will now be simpler to you. Greetings. -- Jose Luis Domingo Lopez Linux Registered User #189436 Debian Linux Sid (Linux 2.6.5) ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
