Ingo,
I’m sorry, I carelessly and stupidly copied the wrong set of lines from tcpdump.
The tcpdump was performed on the client, this shows a failure from the client
to the server showing “TCP(6)”
Which I think is the problem. The server is IPv4 only, xinetd specified the
flag as “IPv4” and the inbound traffic is IPv4.
Sorry for the earlier error.
Brian
11:29:40.183354 IP (tos 0xc0, ttl 64, id 11278, offset 0, flags [none], proto
ICMP (1), length 80)
biowork2.health1.hcom.health.state.ny.us > flower.wadsworth.org: ICMP host
biowork2.health1.hcom.health.state.ny.us unreachable - admin prohibited, length
60
IP (tos 0x0, ttl 64, id 9375, offset 0, flags [DF], proto TCP (6), length
52)
flower.wadsworth.org.516 > biowork2.health1.hcom.health.state.ny.us.amanda:
Flags [S], cksum 0xfc6b (correct), seq 2828866963, win 49640, options [mss
1460,nop,wscale 0,nop,nop,sackOK], length 0
From: Ingo Schaefer <[email protected]>
Date: Monday, May 14, 2018 at 3:16 PM
To: "Cuttler, Brian R (HEALTH)" <[email protected]>,
"[email protected]" <[email protected]>
Subject: AW: ipv4 vs ipv6
ATTENTION: This email came from an external source. Do not open attachments or
click on links from unknown senders or unexpected emails.
Hello Brian,
Your tcpdump Output is just ARP traffic for getting the ethernet address to the
IP address.
And according to the length in tcpdump output I would say it is requesting the
ethernet address to an IPv4 IP address.
So nothing wrong there.
Regards,
Ingo
Gesendet von meinem BlackBerry 10-Smartphone.
Von: Cuttler, Brian R (HEALTH)
Gesendet: Montag, 14. Mai 2018 17:44
An: [email protected]
Betreff: ipv4 vs ipv6
Hello Amanda users,
For some reason I’m not seeing much/any Amanda traffic, I did re-register with
a new email address last month…
Installing Amanda-client on an ununtu system, when I run # amcheck from the
server I’m seeing the following in tcpdump output.
flower.wadsworth.org.516 > biowork2.health1.hcom.health.state.ny.us.amanda:
Flags [R], cksum 0x3d33 (correct), seq 2828866964, win 49640, length 0
11:29:44.054702 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
flower.wadsworth.org tell biowork2.health1.hcom.health.state.ny.us, length 28
11:29:44.054796 ARP, Ethernet (len 6), IPv4 (len 4), Reply flower.wadsworth.org
is-at 00:14:4f:21:10:c2 (oui Unknown), length 46
That is, Amanda-client is being activated by IPv4 but responding using IPv6. I
know that is mentioned in the mail archives and I have checked, re-installed
xinetd on the client and verified flags are IPv4.
root@biowork2:/etc/ufw/applications.d# more /etc/xinetd.d/amanda
# default: on
#
# description: Amanda services for Amanda server and client.
#
service amanda
{
disable = no
flags = IPv4
socket_type = dgram
protocol = udp
wait = no
user = amandabackup
group = disk
groups = yes
# server = /usr/lib/amanda/amandad
server = /usr/lib/x86_64-linux-gnu/amanda/amandad
server_args = -auth=bsdtcp amdump amindexd amidxtaped
}
Either I’m missing a step or I’m not chasing the correct problem.
Any help would be appreciated.
Brian
Brian Cuttler, Wadsworth Center/NYS Dept of Health
Albany, NY 12201
