Re: Learning ipv6 quirks

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On 6/22/21 8:55 PM, Robert McBroom via users wrote:
On 6/21/21 11:41 PM, Gordon Messmer wrote:
On 6/21/21 6:17 AM, Robert McBroom via users wrote:
@RobertPC ~]# mount -v -t nfs [fd2e:cb3b:f005::ec1]:/mnt/HD/HD_a2/mcstuffy /mnt/mcstuffy
mount.nfs: timeout set for Mon Jun 21 06:42:25 2021
mount.nfs: trying text-based options 'vers=4.2,addr=fd2e:cb3b:f005::ec1,clientaddr=fd2e:cb3b:f005::ec1'
mount.nfs: mount(2): Connection refused

1: Is the nfs port open on ipv6?  Use "ss -ln | grep :2049" and look for a listening port with an IPv6 address, like:
    tcp    LISTEN     0      64     [::]:2049 [::]:*
2: Does your firewall allow access to port 2049 on IPv6?  Use "firewall-cmd --list-services" and look for "nfs", or use "ip6tables -L" and look for the input chain for your default zone (possibly IN_public_allow).

root@MyCloudEX2Ultra ~ # ss -ln | grep :2049
-sh: ss: not found


In that case you probably only have busybox's netstat, and I don't know what flags it supports.  Try "netstat -tln" and if that doesn't work maybe "netstat -ln" to get a list of the listening ports.


root@MyCloudEX2Ultra ~ # ip6tables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
           tcp      anywhere             anywhere             tcp dpt:22 state NEW recent: SET name: SSH side: source mask: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff SSHBFATK   tcp      anywhere             anywhere             tcp dpt:22 state NEW recent: UPDATE seconds: 600 hit_count: 201 name: SSH side: source mask: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff


The system's input chain should allow NFS traffic on IPv6 by virtue of the ACCEPT policy.  That suggests that the NFS service isn't listening on an IPv6 network socket.
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