13 Jan
2025
13 Jan
'25
12:46 p.m.
Their technical support was able to put the box into bridge mode. With the
gateway in bridge mode, the ICMP packets are arriving intact. Crazy - must
be a bug with the NAT code in the gateway's firmware.
73,
Eric - AE0JE
On Mon, Jan 13, 2025 at 12:31 AM Tony Langdon via 44net <
44net(a)mailman.ampr.org> wrote:
I solved all my router issues by moving my IPIP
gateway offsite and
using a ZeroTier virtual LAN to bridge the remote router to a LAN
segment here. Works well, only adds a few mS latency, but given that
the IPIP network isn't really a high performance network, this is
inconsequential in practice.
On 13/1/25 4:14 pm, Gavin Rogers via 44net wrote:
Hi Eric.
A shame you're not able to directly connect to your ISP's incoming
interface, with their modem being a mysterious blackbox it's going to
be hard. Do you have any controls at all on the ISP modem, perhaps
features like its VPN passthrough is interfering?
I just did a packet capture for a while from my link, and I'm
receiving nothing but good traffic from the USCD gateway. (although in
practice it is incredibly slow here in Australia - less than 1Mbit/sec)
If you need a far-end node to set up some packet captures with or set
up an iperf node or the like, let me know.
73
Gavin
VK6HGR
On 13/01/2025 12:57 pm, Eric Johnson via 44net wrote:
--
73 de Tony VK3JED/VK3IRL
http://vkradio.com
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All,
I was trying to bring up an AMPRNet IPIP tunnel in my lab network,
but when I did a packet capture on the WAN side of the gateway I am
setting up, I noticed that on average, about 80% of the IPIP packets
I receive from the UCSD gateway have their inner headers corrupted.
As far as I can tell, the first 4 bytes of the inner header are being
overwritten with a garbage byte sequence (hex 00-04-00-00). I have
included a packet capture showing what's going on. At packet 63, the
RIP announcement starts, and continues through packet 100, so there's
some known-good traffic in there.
Has anyone seen anything like this before?
I have another AMPRNet IPIP tunnel set up on a datacenter server, and
it has no such problem, so this is an isolated issue (i.e., not an
issue with the UCSD gateway). The only other thing I could suspect is
that the ISP-issued modem/gateway combo unit. Of course, I have no
visibility into traffic upstream of this unit, so I don't have a way
to know if it is causing the corruption. Unfortunately, my ISP
doesn't let me disable the gateway function of the unit, so I have to
suspect the firmware of this device.
Any and all help is appreciated. I am going to call my ISP tomorrow
and see if they are aware of any issues with these modem/gateway units.
Thanks,
Eric Johnson - AE0JE
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