Weird network in jail

[mururoa]

Hello,

With a recent installed jail I have strange network problems.
First I have something like 5 seconds delay before I get login prompt with ssh.
The jail is a rdiff-backup server but if I just ssh and then start the backup script it never succeeds. I have to ping the backuped server before and then the backup succeed.

This is the routing tables :

Routing tables

Internet:
Destination Gateway Flags Netif Expire
default 192.168.0.1 UGS epair0b
127.0.0.1 link#1 UH lo0
192.168.0.0/24 link#2 U epair0b
192.168.0.96 link#2 UHS lo0


and the network config :

epair0b: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=8<VLAN_MTU>
ether 9e:9a:22:52:de:ef
inet 192.168.0.96 netmask 0xffffff00 broadcast 192.168.0.255
nd6 options=9<PERFORMNUD,IFDISABLED>
media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
status: active


Jail is FreeBSD 10.3. FreeNAS 9.10 latest update.

Any idea of what could be wrong?

 

[Sakuru]

How much RAM do you have? Is VIMAGE enabled on this jail?

 

[mururoa]

I have only 4 GB and VIMAGE is activated for this jail.

 

[SweetAndLow]

You don't have enough RAM. Fix that

Sent from my Nexus 5X using Tapatalk

 

[Sakuru]

The minimum requirement for FreeNAS is 8 GB of RAM. You will have all sorts of weird issues until you have at least that much RAM.
http://www.freenas.org/hardware-requirements/
https://forums.freenas.org/index.php?resources/hardware-recommendations-guide.12/

 

[mururoa]

I cant do that :(
The server is a Thecus N5550 with Freenas installed on it instead of sub-par Thecus OS.
And maximum ram is 4 GB, not more.
I plan to setup a new server but it will be bigger and will draw more power.

 

[SweetAndLow]

If that all the RAM you can use than you can't use freenas.

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[Jailer]

Save yourself the hassle and headache and wait until you have adequate hardware to run FreeNAS.

 

[mururoa]

Well, I found 4 Gb memory for N5550.
I'm not sure if it will be ok but I bet on it.
Official max size is 2 * 2 Gb but this memory module is sold specificaly for N5550, so ...
Before I had checked memory usage on the NAS and free mem was ridicously low.
I the mean time I will shutdown the other jail of the NAS.

 

[SweetAndLow]

Free memory doesn't matter, ideally you have 100% memory used. You bought it so your operating system should use it right? The problem is with less it can't even run all the tools and applications it needs and ends up just shutting down random process when it needs more memory. This causes the strange behavior people see all the time.

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[mururoa]

Ok, now I have 8 GB and so, plenty of free memory.
BUT, the problem is the same so it's time to search outside possible memory problems.
Basically, I cant reach any server before pinging it before.
Like :


$ ping -c 2 wiki
PING wiki.maison.local (192.168.0.84): 56 data bytes

--- wiki.maison.local ping statistics ---
2 packets transmitted, 0 packets received, 100.0% packet loss
$ ping 192.168.0.84
PING 192.168.0.84 (192.168.0.84): 56 data bytes
64 bytes from 192.168.0.84: icmp_seq=2 ttl=64 time=1.954 ms
^C
--- 192.168.0.84 ping statistics ---
3 packets transmitted, 1 packets received, 66.7% packet loss
round-trip min/avg/max/stddev = 1.954/1.954/1.954/0.000 ms
$ ping -c 2 wiki
PING wiki.maison.local (192.168.0.84): 56 data bytes
64 bytes from 192.168.0.84: icmp_seq=0 ttl=64 time=0.329 ms
64 bytes from 192.168.0.84: icmp_seq=1 ttl=64 time=7.748 ms

--- wiki.maison.local ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.329/4.038/7.748/3.710 ms


 

[SweetAndLow]

Are you using lagg of some kind? Disable it if you are. Also make sure your static IP is outside the DHCP range of your DHCP server so you don't have a IP conflict.

Sent from my Nexus 5X using Tapatalk

 

[mururoa]

Yes I'm using lagg.
I guess you get something there.
But I would like to avoid to disable teaming on the nas. Maybe it's the lagg mode ?

 

[SweetAndLow]

Disable it and see if it works better. Lagg works just fine but 99% of people always set it up wrong. And looking at your Nas hardware specs I'm pretty sure you can't even benefit from lagg.

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[pirateghost]

Why do people think they need LAGG?

 

[Jailer]

Why do people think they need LAGG?

Because 2 is always better than 1.

 

[mururoa]

Why do people think they need LAGG?

Not obvious ?
I can get up to 6 clients accessing NAS so more than 1 GB helps sometimes.

Anyway, I have disabled the lagg and that was the problem.
But, how come it's that hard to get that information ???
There should be plenty of jails running on lagg ...
Is there problems too with LACP laggs ?

 

[SweetAndLow]

Zero problems with lacp except for the person setting it up. What switch do you have and what supported protocols does it have?

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[mururoa]

I have Microtik switches.
Very complete, and cheap too.
They can do LACP and many others : http://wiki.mikrotik.com/wiki/Manual:Interface/Bonding#Bonding_modes

 

[pirateghost]

Not obvious ?
I can get up to 6 clients accessing NAS so more than 1 GB helps sometimes.

If you think LACP will help, then more power to you.