Hi all, Thanks for all your suggestions. Adding "publish-a-on-ipv6=yes" (the other options were already as suggested by Phil) fixed the problem of the IPv4 lookups, although - if I understand correctly - the IPv4 lookup is now performed via an IPv6 broadcast rather than the IPv4 broadcast that normally should work. Regarding a firewall as a possible cause: This is, afaik, not likely because I'm not using any on the local network. Of course, there's one running on the router, but only for the external interface. The avahi-daemon.conf is a more likely cause, but I'm using the stock Gentoo versions (which is, I believe, an unmodified version from the avahi package), only with the publish-a-on-ipv6 option. Furthermore, the configuration on all three machines I've tested is identical and only one of them, the htpc, has invisible IPv4 services. Yesterday, I was finally able to test with a second cable. Having connected both the laptop and the htpc via cable, the laptop was sometimes able to detect the IPv4 services on the htpc, and sometimes not. There was no change for the second laptop, however, which was still unable to detect anything IPv4 related on the htpc. Although this combination of findings is a bit puzzling, I am more and more suspecting the router of doing something bad to IPv4 broadcast packages on the wired interface. In any way, I'm more or less convinced that it's not avahi that's causing the problems, so that makes my problems irrelevant to this mailing list :) I hope they will be gone when I upgrade my internet connection and get a new router from a different brand. Thanks for all the input! Best, Marc <div class="gmail_quote">2010/3/19 Lennart Poettering <<a href="mailto:lennart@poettering.net">lennart@poettering.net</a>> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div class="im">On Fri, 12.03.10 01:09, Marc Heerdink (<a href="mailto:marc.heerdink@gmail.com">marc.heerdink@gmail.com</a>) wrote: > Hi, > > First of all, thanks for the great tool that Avahi seems to be. > Unfortunately, it isn't being so great for me so far, which is why I'm > mailing. I'm trying to set up Avahi in my local network, using > (currently) just two computers, a HTPC and a laptop. Both of them are > running very recent installations of Gentoo, using the latest stable > packages and Avahi 0.6.25. The only difference is that the laptop > version is compiled with mono support and the HTPC version not, but I > suspect that isn't causing my issues. > > Basically, the problem is that only the IPv6 services on the HTPC are > visible to the laptop, while I'd like to use the IPv4 version (eg XBMC > web server, SSH), The HTPC, on the other hand, can sometimes 'see' the > IPv4 services on the Laptop and sometimes not. To either computer, all > local (IPv4 & IPv6) and IPv6 services of the other computer are always > visible. For example: </div>Sounds as if you either have a firewall running that blocks mcast traffic, or that you have set up /etc/avahi/avahi-daemon.conf in a weird way (see avahi-daemon.conf(5)) for more information. Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net <a href="http://0pointer.net/lennart/" target="_blank">http://0pointer.net/lennart/</a> GnuPG 0x1A015CC4 <div><div></div><div class="h5">_______________________________________________ avahi mailing list <a href="mailto:avahi@lists.freedesktop.org">avahi@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/avahi" target="_blank">http://lists.freedesktop.org/mailman/listinfo/avahi</a> </div></div></blockquote></div>