Re: Learning ipv6 quirks

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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).
BusyBox v1.30.1 (2020-09-04 02:41:28 UTC) built-in shell (ash)
Enter 'help' for a list of built-in commands.

root@MyCloudEX2Ultra ~ # ss -ln | grep :2049
-sh: ss: not found
root@MyCloudEX2Ultra ~ # firewall-cmd --list-services
-sh: firewall-cmd: not found
root@MyCloudEX2Ultra ~ # help
Built-in commands:
------------------
        . : [ [[ alias bg break cd chdir command continue echo eval exec
        exit export false fg getopts hash help history jobs kill let
        local printf pwd read readonly return set shift source test times

        trap true type ulimit umask unalias unset wait


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

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain SSHBFATK (1 references)
target     prot opt source               destination
LOG        all      anywhere             anywhere             limit: avg 5/min burst 5 LOG level info prefix "SSH: Detect brute force atk! "
DROP       all      anywhere             anywhere

root@MyCloudEX2Ultra ~ # cat /etc/hosts
127.0.0.1 localhost localhost.localdomain
192.168.1.239 MyCloudEX2Ultra MyCloudEX2Ultra
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

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