31 Aug
2018
31 Aug
'18
11:33 p.m.
On 08/31/2018 10:24 AM, Cornelius Keck wrote:
But, I liked the way to have physical control over my
setup, still do,
so there was, is no reason to switch at this time. Given different
circumstances, I might.
I've actually seen / discussed some options to combine the static IP
that you get with inexpensive VPSs with the only dynamic nature of some
residential connections.
I'd be happy to talk about details on COFF if people are interested.
--
Grant. . . .
unix || die
2 Sep
2 Sep
4:20 a.m.
New subject: [TUHS] RetroNet… Virtual is cheap.
On 2018-Aug-31 11:33:19 -0600, Grant Taylor via COFF <coff(a)minnie.tuhs.org> wrote:
On 08/31/2018 10:24 AM, Cornelius Keck wrote:
My approach is a script on the client system (that has dynamic address) that
compares its external address with its address in DNS. If they differ, it
sends an update to the DNS server. The script is hooked into dhclient so
it's invoked when the address is updated or renewed.
The "DNS server" is a hack I've added to Iodine[1] - for an "A"
lookup, it
does a readlink(2) of the FQDN in a config directory and treats the target
as an IPv4 address[2]. This FQDN is within a subdomain I've delegated to
Iodine - I have a CNAME pointing into the subdomain. The client updates the
symlink by SSHing to the DNS server host and running a command that takes
the domain name and address and updates the symlink.
Whilst I've managed to get a static address at home, I still find it useful
for VPSs where the address is static whilst the instance is running but not
preserved across rebuilds.
As an example, lookup gce1.rulingia.com.
[1] http://code.kryo.se/iodine/
[2] This is good enough because Australian ISPs don't believe in IPv6
--
Peter Jeremy
But, I liked the way to have physical control
over my setup, still do,
so there was, is no reason to switch at this time. Given different
circumstances, I might.
I've actually seen / discussed some options to combine the static IP
that you get with inexpensive VPSs with the only dynamic nature of some
residential connections.
8 a.m.
New subject: [COFF] [TUHS] RetroNet… Virtual is cheap.
On 09/01/2018 04:20 PM, Peter Jeremy wrote:
My approach is a script on the client system (that has
dynamic address)
that compares its external address with its address in DNS. If they
differ, it sends an update to the DNS server. The script is hooked into
dhclient so it's invoked when the address is updated or renewed.
That sounds like a very reasonable method to manage Dynamic DNS for a
DHCP client.
That's not quite what I was thinking of. ;-)
First: I'm assuming that the VPS in question has two public IP
addresses. (It may be possible to do this with one, but the routing
gets quite a bit more complex.)
Second: Establish a VPN / tunnel between a client machine and the VPS.
Third: Enable Proxy ARP on the VPS for the second (unused & unbound to
the VPS) IP.
Fourth: Add a route to said second (unused & unbound to the VPS) via
the far side of the VPN / tunnel.
Fifth: Bind the second (unused & unbound to the VPS) ip on the local
VPN / tunnel client.
Hypothetically this will get the second (unused & unbound to the VPS)
such that it can be bound and used by a local client. Thus the local
client will have the globally routed IP address extended to it from the VPS.
The "DNS server" is a hack I've added
to Iodine[1] - for an "A" lookup,
it does a readlink(2) of the FQDN in a config directory and treats the
target as an IPv4 address[2]. This FQDN is within a subdomain I've
delegated to Iodine - I have a CNAME pointing into the subdomain. The
client updates the symlink by SSHing to the DNS server host and running
a command that takes the domain name and address and updates the symlink.
Intriguing. I'll have to check out Iodine. Thank you for the information.
Whilst I've managed to get a static address at
home, I still find it
useful for VPSs where the address is static whilst the instance is
running but not preserved across rebuilds.
Indeed.
As an example, lookup gce1.rulingia.com.
[1]http://code.kryo.se/iodine/
[2] This is good enough because Australian ISPs don't believe in IPv6
I'll have to check out what you're suggesting.
--
Grant. . . .
unix || die
6 Sep
6 Sep
9:41 p.m.
New subject: [COFF] [TUHS] RetroNet… Virtual is cheap.
On Sun, 2 Sep 2018 08:20:55 +1000 Peter Jeremy <peter(a)rulingia.com>
wrote:
My approach is a script on the client system (that has
dynamic
address) that compares its external address with its address in
DNS. If they differ, it sends an update to the DNS server. The
script is hooked into dhclient so it's invoked when the address is
updated or renewed.
Why not just dynamic update whenever the lease is renewed? If nothing
changes, no one will see any change. (I've run like that for 15 years
I think...)
Perry
--
Perry E. Metzger perry(a)piermont.com
10:24 p.m.
New subject: [COFF] [TUHS] RetroNet… Virtual is cheap.
On 09/06/2018 09:41 AM, Perry E. Metzger wrote:
Why not just dynamic update whenever the lease is
renewed? If nothing
changes, no one will see any change. (I've run like that for 15 years
I think...)
That does work from a client point of view.
From a DNS administrators point of view, it's likely to cause
unnecessary updates to the zone and subsequent transfers to slave
servers. All of which is unnecessary.
Perhaps this could be detected and avoided by returning a synthetic
return to the client doing the update.
--
Grant. . . .
unix || die
7 Sep
7 Sep
1:42 a.m.
New subject: [COFF] [TUHS] RetroNet… Virtual is cheap.
On Thu, 6 Sep 2018 10:24:09 -0600 Grant Taylor via COFF
<coff(a)minnie.tuhs.org> wrote:
On 09/06/2018 09:41 AM, Perry E. Metzger wrote:
I guess I've always viewed my time as being worth more. The data
being transferred is a few k, smaller than the size of one icon on my
desktop, I doubt the communications overhead is noticed in the
hailstorm of video going over the networks in question. Your Milage
May Differ.
Perry
--
Perry E. Metzger perry(a)piermont.com
Why not just dynamic update whenever the lease is
renewed? If
nothing changes, no one will see any change. (I've run like that
for 15 years I think...)
That does work from a client point of view.
From a DNS administrators point of view, it's likely to cause
unnecessary updates to the zone and subsequent transfers to slave
servers. All of which is unnecessary.
3:13 a.m.
New subject: [COFF] [TUHS] RetroNet… Virtual is cheap.
On 09/06/2018 01:42 PM, Perry E. Metzger wrote:
I doubt the communications overhead is noticed in the
hailstorm of video
going over the networks in question. Your Milage May Differ.
The problem isn't bandwidth related. It's more that it will cause
additional and completely unnecessary (what is tantamount) to DB
transactions and fan out replication to all other servers. For
something that is a completely unnecessary change. It functionally
rolls the serial number and all the additional overhead associated with it.
Because someone didn't check if the IP actually changed.
Compound this by 100s ~ 1,000s of customers doing the same thing.
--
Grant. . . .
unix || die
10 Sep
10 Sep
12:35 p.m.
New subject: [TUHS] RetroNet… Virtual is cheap.
On Sun, 2 Sep 2018, Peter Jeremy wrote:
[2] This is good enough because Australian ISPs
don't believe in IPv6
If I go to a site that reports my IP address, I get IPv6 (I have a static
IPv4 address), which appears to be the default used by my router (a
Fastnet 5355 or something, which T$ appear to be unloading on us).
I tried asking T$ for a static IPv6 range, but was unable to find anyone
who even knew what I was talking about.
-- Dave
14 Sep
14 Sep
3:39 a.m.
New subject: [COFF] [TUHS] RetroNet… Virtual is cheap.
On Mon, 10 Sep 2018 16:35:56 +1000 (EST) Dave Horsfall
<dave(a)horsfall.org> wrote:
On Sun, 2 Sep 2018, Peter Jeremy wrote:
Have you tried DHCPv6ing from your router?
Perry
--
Perry E. Metzger perry(a)piermont.com
[2] This is good enough because Australian ISPs
don't believe in
IPv6
If I go to a site that reports my IP address, I get IPv6 (I have a
static IPv4 address), which appears to be the default used by my
router (a Fastnet 5355 or something, which T$ appear to be
unloading on us).
I tried asking T$ for a static IPv6 range, but was unable to find
anyone who even knew what I was talking about.
2291
days inactive
2304
days old
8 comments
4 participants
participants (4)
-
Dave Horsfall -
Grant Taylor -
Perry E. Metzger -
Peter Jeremy