Q: IPv6-only setup - get rid of 127.0.0.1
Hi, I am running F17 in IPv6-only network (behind NAT64 gateway) and would like to get rid of 127.0.0.1 address from lo interface. Please, don't tell me, that this would break lots of stone-aged software, because such configuration works for about a year already in non-RH distro. I can't find who sets inet 127.0.0.1/8 scope host address to lo interface. Commented out the IPADDRESS in ifcfg-lo - no result. Who's doing this? -- Regards,-- Sir Raorn. --- http://thousandsofhate.blogspot.com/ signature.asc Description: Digital signature -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
On Thu, Jun 21, 2012 at 04:42:54PM +0400, Alexey I. Froloff wrote: Hi, I am running F17 in IPv6-only network (behind NAT64 gateway) and would like to get rid of 127.0.0.1 address from lo interface. Please, don't tell me, that this would break lots of stone-aged software, because such configuration works for about a year already in non-RH distro. I can't find who sets inet 127.0.0.1/8 scope host address to lo interface. Commented out the IPADDRESS in ifcfg-lo - no result. systemd sets this very early during boot. -- Tomasz TorczThere exists no separation between gods and men: xmpp: zdzich...@chrome.pl one blends softly casual into the other. -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
On Thu, Jun 21, 2012 at 02:44:42PM +0200, Tomasz Torcz wrote: I can't find who sets inet 127.0.0.1/8 scope host address to lo interface. Commented out the IPADDRESS in ifcfg-lo - no result. systemd sets this very early during boot. Is is configurable? -- Regards,-- Sir Raorn. --- http://thousandsofhate.blogspot.com/ signature.asc Description: Digital signature -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
On Thu, 21.06.12 16:59, Alexey I. Froloff (ra...@raorn.name) wrote: On Thu, Jun 21, 2012 at 02:44:42PM +0200, Tomasz Torcz wrote: I can't find who sets inet 127.0.0.1/8 scope host address to lo interface. Commented out the IPADDRESS in ifcfg-lo - no result. systemd sets this very early during boot. Is is configurable? Nope. Just dropping the loopback IP address doesn't disable IPv4. if you want to disable IPv4 like you can disable IPv6 then this probably needs kernel support. Disabling IPv4 should result in socket(AF_INET, ...) returning EAFNOSUPPORT. Just taking away 127.0.0.1 doesn't do anything like that. Lennart -- Lennart Poettering - Red Hat, Inc. -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
Lennart Poettering (mzerq...@0pointer.de) said: On Thu, 21.06.12 16:59, Alexey I. Froloff (ra...@raorn.name) wrote: On Thu, Jun 21, 2012 at 02:44:42PM +0200, Tomasz Torcz wrote: I can't find who sets inet 127.0.0.1/8 scope host address to lo interface. Commented out the IPADDRESS in ifcfg-lo - no result. systemd sets this very early during boot. Is is configurable? Nope. Just dropping the loopback IP address doesn't disable IPv4. if you want to disable IPv4 like you can disable IPv6 then this probably needs kernel support. Disabling IPv4 should result in socket(AF_INET, ...) returning EAFNOSUPPORT. Just taking away 127.0.0.1 doesn't do anything like that. Right - unlike IPv6, where it can be fully disabled, the best you can do with IPv4 is just drop all IPv4 addresses. Bill -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
On Thu, Jun 21, 2012 at 03:39:43PM +0200, Lennart Poettering wrote: Disabling IPv4 should result in socket(AF_INET, ...) returning EAFNOSUPPORT. Just taking away 127.0.0.1 doesn't do anything like that. Yep, and it doesn't prevent for anyone listening on 0.0.0.0... But still, is it possible to get rid of 127.0.0.1, or it's hardcoded in systemd? -- Regards,-- Sir Raorn. --- http://thousandsofhate.blogspot.com/ signature.asc Description: Digital signature -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
On Thu, 21.06.12 18:22, Alexey I. Froloff (ra...@raorn.name) wrote: On Thu, Jun 21, 2012 at 03:39:43PM +0200, Lennart Poettering wrote: Disabling IPv4 should result in socket(AF_INET, ...) returning EAFNOSUPPORT. Just taking away 127.0.0.1 doesn't do anything like that. Yep, and it doesn't prevent for anyone listening on 0.0.0.0... But still, is it possible to get rid of 127.0.0.1, or it's hardcoded in systemd? This is hardcoded in systemd, but nothing stops you from dropping this again from the interface. Basically, the logic in systemd is to configured 127.0.0.1 to lo if IPv4 is available and ::1 to lo if IPv6 is available. But if this is later undone or changed this is toally OK. We simply do this by default because this is such basic functionality that lo should work everywhere and always without and specific configuration. Lennart -- Lennart Poettering - Red Hat, Inc. -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
Re: Q: IPv6-only setup - get rid of 127.0.0.1
On Thu, 2012-06-21 at 16:39 +0200, Lennart Poettering wrote: On Thu, 21.06.12 18:22, Alexey I. Froloff (ra...@raorn.name) wrote: On Thu, Jun 21, 2012 at 03:39:43PM +0200, Lennart Poettering wrote: Disabling IPv4 should result in socket(AF_INET, ...) returning EAFNOSUPPORT. Just taking away 127.0.0.1 doesn't do anything like that. Yep, and it doesn't prevent for anyone listening on 0.0.0.0... But still, is it possible to get rid of 127.0.0.1, or it's hardcoded in systemd? This is hardcoded in systemd, but nothing stops you from dropping this again from the interface. Basically, the logic in systemd is to configured 127.0.0.1 to lo if IPv4 is available and ::1 to lo if IPv6 is available. But if this is later undone or changed this is toally OK. We simply do this by default because this is such basic functionality that lo should work everywhere and always without and specific configuration. NetworkManager also ensures that lo has 127.0.0.1, but that's only done once on startup of NM. This functionality has existed in NM for quite a long time, predating systemd. I'd be fine with disabling it for Fedora now that systemd handles it. Dan -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
