Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
On Fri, Aug 25, 2006 at 08:39:18PM +0200, Marc Haber wrote: On Fri, Aug 25, 2006 at 07:06:25PM +0100, Enrico Zini wrote: On Sat, Feb 25, 2006 at 01:06:43PM +0100, Marc Haber wrote: On Sun, Oct 23, 2005 at 02:07:40PM +0200, Enrico Zini wrote: On Sun, Jun 05, 2005 at 07:34:46PM +0200, Marc Haber wrote: iface net1 inet static test peer address 10.11.10.62 iface net1 inet static test peer address 10.12.10.62 This doesn't seem to work, net1 is always chosen. [...] The best way to solve this would be to keep Linux from answering ARP requests for IP adresses that are on other interfaces, but that is clearly out of guessnet's scope. It just occurred to me while reviewing the open bugs that both your network stanzas are called net1: could it be that that is the problem? I suspect this was an error when anonymizing the configuration. I don't remember any more and need to build a lab for reproduction of the image. Confirmed. Issue reproducible even with the second stanza named net2 instead of net1. In the way to reproduce this, I have seen the local system arping for both peers, and the gateway answered both requests with its MAC address. Greetings Marc -- - Marc Haber | I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things.Winona Ryder | Fon: *49 621 72739834 Nordisch by Nature | How to make an American Quilt | Fax: *49 621 72739835 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
On Sat, Feb 25, 2006 at 01:06:43PM +0100, Marc Haber wrote: On Sun, Oct 23, 2005 at 02:07:40PM +0200, Enrico Zini wrote: On Sun, Jun 05, 2005 at 07:34:46PM +0200, Marc Haber wrote: iface net1 inet static test peer address 10.11.10.62 iface net1 inet static test peer address 10.12.10.62 This doesn't seem to work, net1 is always chosen. [...] The best way to solve this would be to keep Linux from answering ARP requests for IP adresses that are on other interfaces, but that is clearly out of guessnet's scope. It just occurred to me while reviewing the open bugs that both your network stanzas are called net1: could it be that that is the problem? Ciao, Enrico -- GPG key: 1024D/797EBFAB 2000-12-05 Enrico Zini [EMAIL PROTECTED] signature.asc Description: Digital signature
Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
On Fri, Aug 25, 2006 at 08:39:18PM +0200, Marc Haber wrote: It just occurred to me while reviewing the open bugs that both your network stanzas are called net1: could it be that that is the problem? I suspect this was an error when anonymizing the configuration. I don't remember any more and need to build a lab for reproduction of the image. This is going to take a while. Don't worry: I was going to mark it wontfix since we agreed that it's more of a problem with Linux answering ARP requests from all interfaces, but then I spotted those two networks with the same name and I wanted to double check. I'll tag it wontfix then, since it does not seem to be something that can be fixed in guessnet. Ciao, Enrico -- GPG key: 1024D/797EBFAB 2000-12-05 Enrico Zini [EMAIL PROTECTED] signature.asc Description: Digital signature
Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
On Fri, Aug 25, 2006 at 07:06:25PM +0100, Enrico Zini wrote: On Sat, Feb 25, 2006 at 01:06:43PM +0100, Marc Haber wrote: On Sun, Oct 23, 2005 at 02:07:40PM +0200, Enrico Zini wrote: On Sun, Jun 05, 2005 at 07:34:46PM +0200, Marc Haber wrote: iface net1 inet static test peer address 10.11.10.62 iface net1 inet static test peer address 10.12.10.62 This doesn't seem to work, net1 is always chosen. [...] The best way to solve this would be to keep Linux from answering ARP requests for IP adresses that are on other interfaces, but that is clearly out of guessnet's scope. It just occurred to me while reviewing the open bugs that both your network stanzas are called net1: could it be that that is the problem? I suspect this was an error when anonymizing the configuration. I don't remember any more and need to build a lab for reproduction of the image. This is going to take a while. Greetings Marc -- - Marc Haber | I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things.Winona Ryder | Fon: *49 621 72739834 Nordisch by Nature | How to make an American Quilt | Fax: *49 621 72739835 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
On Sun, Oct 23, 2005 at 02:07:40PM +0200, Enrico Zini wrote: On Sun, Jun 05, 2005 at 07:34:46PM +0200, Marc Haber wrote: Given is a site with a single Linux gateway which has a multitude of ethernets attached. DHCP is not in use, and the MAC addresses of the interface are not known (might change any time). A notebook needs to be able to use any of these networks, so it should detect its network regardless of which physical network it has been plugged in. [...] iface net1 inet static test peer address 10.11.10.62 iface net1 inet static test peer address 10.12.10.62 This doesn't seem to work, net1 is always chosen. It looks like the gateway is answering to arping 10.11.10.62 even if the arping request comes in from the network 10.12.10. I didn't debug in detail, but I surely hope that the replies can be distinguished, so that guessnet can see which answer is the correct one. I'll happily debug if you tell me what to do. Sorry for the late reply. This looks difficult: the only way to distinguish the reply would be by IP or by MAC. However, from what you said, the IP is random among the possible subnets, and the MAC could change at any time. I agree. Perhaps there are other machines in the subnet you can test for using the MAC address, like a network printer or another host? That would make guessnet depend on infrastructure that might be moved or replaced without really having an impact on networking. The best way to solve this would be to keep Linux from answering ARP requests for IP adresses that are on other interfaces, but that is clearly out of guessnet's scope. Greetings Marc -- - Marc Haber | I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things.Winona Ryder | Fon: *49 621 72739834 Nordisch by Nature | How to make an American Quilt | Fax: *49 621 72739835 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
On Sun, Jun 05, 2005 at 07:34:46PM +0200, Marc Haber wrote: Given is a site with a single Linux gateway which has a multitude of ethernets attached. DHCP is not in use, and the MAC addresses of the interface are not known (might change any time). A notebook needs to be able to use any of these networks, so it should detect its network regardless of which physical network it has been plugged in. [...] iface net1 inet static test peer address 10.11.10.62 iface net1 inet static test peer address 10.12.10.62 This doesn't seem to work, net1 is always chosen. It looks like the gateway is answering to arping 10.11.10.62 even if the arping request comes in from the network 10.12.10. I didn't debug in detail, but I surely hope that the replies can be distinguished, so that guessnet can see which answer is the correct one. I'll happily debug if you tell me what to do. Sorry for the late reply. This looks difficult: the only way to distinguish the reply would be by IP or by MAC. However, from what you said, the IP is random among the possible subnets, and the MAC could change at any time. Perhaps there are other machines in the subnet you can test for using the MAC address, like a network printer or another host? Ciao, Enrico -- GPG key: 1024D/797EBFAB 2000-12-05 Enrico Zini [EMAIL PROTECTED] signature.asc Description: Digital signature
Bug#312119: guessnet: test peer address misdetects if multiple networks on same gateway
Package: guessnet Version: 0.36-1 Severity: normal Given is a site with a single Linux gateway which has a multitude of ethernets attached. DHCP is not in use, and the MAC addresses of the interface are not known (might change any time). A notebook needs to be able to use any of these networks, so it should detect its network regardless of which physical network it has been plugged in. /e/n/i looks like this: mapping eth0 script /usr/sbin/guessnet-ifupdown map default: default map timeout: 3 map verbose: true iface net1 inet static address 10.11.10.59 netmask 255.255.255.240 broadcast 10.11.10.63 gateway 10.11.10.62 test peer address 10.11.10.62 iface net1 inet static address 10.12.10.59 netmask 255.255.255.240 broadcast 10.12.10.63 gateway 10.12.10.62 test peer address 10.12.10.62 This doesn't seem to work, net1 is always chosen. It looks like the gateway is answering to arping 10.11.10.62 even if the arping request comes in from the network 10.12.10. I didn't debug in detail, but I surely hope that the replies can be distinguished, so that guessnet can see which answer is the correct one. I'll happily debug if you tell me what to do. Greetings Marc -- System Information: Debian Release: 3.1 APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.9-zgserver Locale: LANG=C, LC_CTYPE=de_DE (charmap=ISO-8859-1) Versions of packages guessnet depends on: ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an pn libpcap0 Not found. ii libpopt01.7-5lib for parsing cmdline parameters -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
