Created attachment 1307821 [details] Command output from the Fedora-25 HOST Hello Friends: I'm not sure if this is a bug, but here is my sudden issue. ---------------------------------------- The Linux/LXC single-box cluster setup: ---------------------------------------- 1) I use Fedora x86_64 (currently Fedora-25) as the LXC/HOST O/S. I use CentOS-6 x86_64 (currently CentOS-6.9 Final) for the six (qty. 6) LXC/GUEST O/S'. 2) This was working for a long time (a few years), but suddenly does not after a 'sudo dnf -y update' (HOST) and 'sudo yum -y update' (GUESTS). It has been a few months since I booted this HOST/GUESTS LXC "cluster" and, as usual, O/S updates are the first thing that I perform. This may provide a hint if some underlying system-level component(s)/behavior(s) changed during that time. 3) The Fedora HOST and CentOS-6 GUESTS are on the same subnet, and share the same default router: 192.168.0.0/24; 192.168.0.1 (all standard stuff). 4) The Fedora Host does not have any firewall/firewalld RPM packages installed, and therefore doesn't not run a firewall. I removed this long ago to simplify things. ---------------------------------------- ---------------------------------------- The issue ---------------------------------------- 1) After performing the above O/S updates to the HOST and GUESTS, from within any GUEST, I can no longer (a) successfully ping/ssh guest-to-guest or (b) ping the default router. 2) I can, however, ping/ssh HOST-to-GUEST and GUEST-to-HOST with no issue. 3) From any computer outside this setup -- which, by the way, are also on the same subnet and share the same default router as above -- I can ping/ssh to the HOST but cannot to any of the GUESTS. 3) Other than performing the aforementioned O/S updates, I didn't alter anything. ---------------------------------------- ---------------------------------------- Some output ---------------------------------------- I attached some command output to this submission. Note that the GUESTS are named vps00, vps01, vps02, vps03, vps04 and vps10. While the HOST is named lxc-host. Throughout the attachment, you'll see some notes that I annotated it with. ---------------------------------------- Any ideas? Thank you in advance.
Created attachment 1307822 [details] Command output from a CentOS-6.9 Final GUEST
P.S. There are two attachments (with some annotations within them): - HOST.txt - ONE_GUEST.txt Thank you! :)
SOLVED ... Thanks to the accepted answer in this POST https://unix.stackexchange.com/questions/125599/settings-when-using-a-bridge, I was able to finally figure out the iptables(1M) entries that were missing. Here they are: sudo iptables -A INPUT -i eth0 -j ACCEPT sudo iptables -A INPUT -i br0 -j ACCEPT sudo iptables -A FORWARD -i br0 -j ACCEPT I don't know what Fedora HOST O/S changes occurred to make these entries not be there suddenly (meaning after doing "dnf -y update; reboot" after a few months of not doing that), but would sure love to know because now I have to hardcode these entries in somewhere (which I'm not thrilled about). :) Any insight from friends here would be appreciated because maybe I can avoid doing that with some guidance (thanks). I hope this helps others who bridge their LXC guests like I do.
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