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Find where packet is dropped
![[dk]](/s/countries/dk.gif) Shadow Hawkins on Thursday, 16 February 2017 10:02:49
Is my router or my ISP dropping packets to/from POP?
I have a 4G router and a ADSL-router, the latter only 1Mb/s
When I route to the pop over ADSL, the connection works fine
10:36:53.881855 IP 192.168.1.254.44928 > dkcph01.sixxs.net.5072: UDP, length 104
10:36:53.927412 IP dkcph01.sixxs.net.5072 > 192.168.1.254.44928: UDP, length 104
traceroute to dkcph01.sixxs.net (93.158.77.42), 30 hops max, 60 byte packets
1 192.168.1.3 (192.168.1.3) 17.898 ms 17.604 ms 17.264 ms <- MY ADSL ROUTER
2 xe-2-1-1-1103.ronnqe10.dk.ip.tdc.net (87.58.0.130) 30.039 ms 34.716 ms 42.157 ms
3 xe-1-0-0-0.bgt-peer1.mmx.se.ip.tdc.net (88.131.143.115) 49.252 ms 55.641 ms 60.560 ms
4 netnod-ix-ge-b-mmo-1500.ip-only.net (195.69.117.92) 68.463 ms 73.828 ms 79.806 ms
5 83.145.2.46 (83.145.2.46) 119.284 ms 113.858 ms 114.203 ms
6 212.112.188.66 (212.112.188.66) 103.168 ms 46.887 ms 31.330 ms
7 83.140.255.70 (83.140.255.70) 44.473 ms 50.255 ms *
8 dkcph01.sixxs.net (93.158.77.42) 56.382 ms 62.972 ms 68.178 ms
When I route to the 4G, nothing comes back
10:41:54.166050 IP 192.168.1.254.44928 > dkcph01.sixxs.net.5072: UDP, length 105
10:41:57.861203 IP 192.168.1.254.44928 > dkcph01.sixxs.net.5072: UDP, length 105
10:41:58.443125 IP 192.168.1.254.44928 > dkcph01.sixxs.net.5072: UDP, length 105
traceroute to dkcph01.sixxs.net (93.158.77.42), 30 hops max, 60 byte packets
1 192.168.1.1 (192.168.1.1) 1.431 ms 0.832 ms 1.402 ms <- MY 4G ROUTER
2 192.168.225.1 (192.168.225.1) 1.099 ms 1.391 ms 1.778 ms
3 62.44.164.245 (62.44.164.245) 31.055 ms 31.322 ms 31.740 ms
4 62.44.166.184 (62.44.166.184) 30.979 ms 30.626 ms 30.724 ms
5 212.97.200.65 (212.97.200.65) 31.132 ms 31.472 ms 30.727 ms
6 kbn-b3-link.telia.net (80.239.132.1) 33.178 ms 19.937 ms 20.330 ms
7 iponly-ic-319310-kbn-b3.c.telia.net (62.115.151.47) 24.211 ms 20.568 ms 21.012 ms
8 213.80.86.252 (213.80.86.252) 33.367 ms 21.022 ms 31.120 ms
9 83.145.2.46 (83.145.2.46) 55.067 ms 58.371 ms 57.875 ms
10 212.112.188.66 (212.112.188.66) 31.118 ms 31.405 ms 32.348 ms
11 83.140.255.70 (83.140.255.70) 34.017 ms 33.506 ms 32.858 ms
12 dkcph01.sixxs.net (93.158.77.42) 28.164 ms 30.134 ms 29.727 ms
Where do I find what is dropping the packets; my router or my 4G provider, Telia.dk?
(Which does not yet run IPv6 on 4G; I have asked repeatedly)
The router is a TP-Link Archer MR200
I can ping the pop nicely:
10:47:19.760772 IP 192.168.1.254 > dkcph01.sixxs.net: ICMP echo request, id 8775, seq 1, length 64
10:47:19.787280 IP dkcph01.sixxs.net > 192.168.1.254: ICMP echo reply, id 8775, seq 1, length 64
Can the tunnel be set to use other ports or protocols?
I have a VPS (at OVH France I think) with true ipv6-connectivity, I could use to debug the connection, if I knew what to look for.
I have tried to get a /64 routed to the VPS, so I could VPN this network to my home network, but this is not yet possible.
Is it possible to NAT all my machines at home through a single IPv6 address at the VPS?
I'd rather not, as defeats the purpose of having some home automation Raspberry's reachable from outside over separate ipv6-addresses.
Find where packet is dropped
When I route to the 4G, nothing comes back
Quite likely they filter certain ports.
Call Your ISP...
Or try one of the many "Am I being filtered" kind of websites that are out there.
Find where packet is dropped
 Shadow Hawkins on Thursday, 16 February 2017 11:05:05
If I start screen and in one window ssh to my private server (VPS in France) and set a listener up:
~# netcat -l -u -p 5072
and on my home machine running aiccu do
~# netcat -u ipv4.of.my.vps 5072
I can type in one netcat window and it appears in the other window, so there appears to be no filtering on port only.
# tcpdump port 5072 -a host ipv4.of.my.vps
11:46:36.102653 IP 192.168.1.254.40886 > ipv4.of.my.vps.5072: UDP, length 8
11:46:44.171299 IP ipv4.of.my.vps.5072 > 192.168.1.254.40886: UDP, length 16
Could ISP really be so sneaky as to block port 5072 from dkcph01.sixxs.net POP, but not from another IP?
Do I need to run service aiccu restart to inform the POP that I change IP (when I change router from ADSL to 4G)?
I tried, and only one packet came back, but could be a packet sent from the old connection on the other router?
11:59:27.076606 IP dkcph01.sixxs.net.5072 > 192.168.1.254.45721: UDP, length 159
11:59:27.079536 IP 192.168.1.254.45721 > dkcph01.sixxs.net.5072: UDP, length 104
Find where packet is dropped
Shadow Hawkins on Thursday, 16 February 2017 11:13:14
To clarify
aiccu is running on 192.168.1.254
4G router is 192.168.1.1, the default gateway for all machines.
ADSL router is 192.168.1.3
To run the tunnel over ADSL I do
# route add dkcph01.sixxs.net gw 192.168.1.3
Find where packet is dropped
Shadow Hawkins on Thursday, 23 March 2017 16:24:21
I have now gotten a router from another ISP, with this I can tunnel to dkcph01.sixxs.net.
But whether it is the router or the ISP which is making the difference, I don't know, and as sixxs is closing 6/6, it is soon a moot point.
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![[ch]](/s/countries/ch.gif)
on Thursday, 16 February 2017 10:27:27
Posting is only allowed when you are