Date: Tue, 1 Sep 2020 07:20:33 -0700 From: Hiroshi Nishida <nishida@asusa.net> To: freebsd-virtualization@freebsd.org Subject: Re: IPv6 Problem with Bhyve Message-ID: <0b2304fd-4799-f56e-2271-169a5348d654@asusa.net> In-Reply-To: <53835548-cd6e-6859-c19d-8dd96d3993f3@asusa.net> References: <53835548-cd6e-6859-c19d-8dd96d3993f3@asusa.net>
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I'm sorry but I sent my first e-mail in an HTML format. Hi, I already asked the same question at https://forums.freebsd.org/threads/ipv6-tcp-connection-issue-with-bhyve.76771/ but haven't got any responses yet. I'd like to ask also here to figure out what causes this problem. I could install Windows Server 2019 on FreeBSD 12.1R + bhyve by mostly following https://wiki.freebsd.org/bhyve/Windows but have the following problem swith TCP/IPv6: * All firewalls are turned off on both host FreeBSD and guest Windows. * The guest Windows is assigned to a static IPv6 address and a DHCP'ed IPv4 address. * Accessing the guest Windows using IPv4 is all OK including RDP, telnet, etc and vice versa. * I can ping from the guest Windows to all IPv6 addresses, vice versa. * However, accessing the guest Windows and accessing from the guest Windows through TCP/IPv6 all fail. Please take a look at https://forums.freebsd.org/threads/ipv6-tcp-connection-issue-with-bhyve.76771 for a tcpdump log on a tcp connection trial from host FreeBSD to guest Windows. Briefly speaking, the 3-way connection does not establish because the host FreeBSD ignores (?) the SYN-ACK from the guest Windows. As for the guest Windows -> the host FreeBSD, the guest sends a SYN packet to the host but the host FreeBSD does not respond to it. The connection trial packet from the guest -> Internet goes through tap0, bridge0 and igb0 but does not seem to reach our IPv6 gateway. Interestingly, I have exactly the same problem also with CentOS 8 + KVM/QEMU. I would appreciate it if anybody could tell me how to fix this. Thank you. -- Hiroshi Nishida ASUSA Corporation
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