19 May
2014
19 May
'14
4:26 p.m.
Hello fellows 44 crew
I have a ping not returning syndrome from my 44 address via Internet.
From any ampr system ping to 44.153.0.1 are answered
ok, but
from internet don't receive answer to pings sent to 44.153.0.1
To try thru Internet I use https://www.wormly.com/test_remote_ping
setting 44.153.0.1 as destination for pings.
System is an ubuntu 10.03 and jnos2.0i, locally pings returns ok.
I made some traces that follows, some related autoexec.nos are at end.
Same symptom happens with several 44 systems, pings from Internet don't
return.
As pings don't return any other tcp function doesn't work either.
Any help/guidance/sugestion will be much appreciated.
Best 73,
lu7abf, Pedro Converso
PD: Router: TL-MR3420 DMZ: 44.153.0.10 (IP of my jnos2)
================================================================
Trace of tun0 interfase made by jnos> trace tun0 211
Here can be seen that tun0 receives Echo request encapsulated thru amprgw
and Reply with no encapsulation, which originating pinger doesn't receive
Mon May 19 16:36:37 2014 - tun0 recv:
IP: len 104 169.228.66.251->44.153.0.1 ihl 20 ttl 39 prot IP
IP: len 84 184.72.226.23->44.153.0.1 ihl 20 ttl 38 DF prot ICMP
ICMP: type Echo Request id 58952 seq 1
0000 45 00 00 68 63 95 00 00 27 04 16 84 a9 e4 42 fb E..hc...'...)dB{
0010 2c 99 00 01 45 00 00 54 33 75 40 00 26 01 5a 3a ,...E..T3u@.&.Z:
0020 b8 48 e2 17 2c 99 00 01 08 00 f1 bb e6 48 00 01 8Hb.,.....q;fH..
0030 2e 5d 7a 53 00 00 00 00 ab 76 0d 00 00 00 00 00 .]zS....+v......
0040 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f ................
0050 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f !"#$%&'()*+,-./
0060 30 31 32 33 34 35 36 37 01234567
Mon May 19 16:36:37 2014 - tun0 recv:
IP: len 104 169.228.66.251->44.153.0.1 ihl 20 ttl 39 prot IP
IP: len 84 184.72.226.23->44.153.0.1 ihl 20 ttl 38 DF prot ICMP
ICMP: type Echo Request id 58952 seq 1
0000 45 00 00 68 63 95 00 00 27 04 16 84 a9 e4 42 fb E..hc...'...)dB{
0010 2c 99 00 01 45 00 00 54 33 75 40 00 26 01 5a 3a ,...E..T3u@.&.Z:
0020 b8 48 e2 17 2c 99 00 01 08 00 f1 bb e6 48 00 01 8Hb.,.....q;fH..
0030 2e 5d 7a 53 00 00 00 00 ab 76 0d 00 00 00 00 00 .]zS....+v......
0040 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f ................
0050 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f !"#$%&'()*+,-./
0060 30 31 32 33 34 35 36 37 01234567
Mon May 19 16:36:37 2014 - tun0 sent:
IP: len 84 44.153.0.1->184.72.226.23 ihl 20 ttl 175 prot ICMP
ICMP: type Echo Reply id 58952 seq 1
0000 45 00 00 54 71 c7 00 00 af 01 d2 e7 2c 99 00 01 E..TqG../.Rg,...
0010 b8 48 e2 17 00 00 f9 bb e6 48 00 01 2e 5d 7a 53 8Hb...y;fH...]zS
0020 00 00 00 00 ab 76 0d 00 00 00 00 00 10 11 12 13 ....+v..........
0030 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 ............ !"#
0040 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 $%&'()*+,-./0123
0050 34 35 36 37 4567
=======================================================================
Trace of encap interfase made by jnos> trace encap 211
Here can be seen that encap interfase receives echo req but don't answer
Mon May 19 16:36:37 2014 - encap recv:
IP: len 84 184.72.226.23->44.153.0.1 ihl 20 ttl 38 DF prot ICMP
ICMP: type Echo Request id 58952 seq 1
0000 45 00 00 54 33 75 40 00 26 01 5a 3a b8 48 e2 17 E..T3u@.&.Z:8Hb.
0010 2c 99 00 01 08 00 f1 bb e6 48 00 01 2e 5d 7a 53 ,.....q;fH...]zS
0020 00 00 00 00 ab 76 0d 00 00 00 00 00 10 11 12 13 ....+v..........
0030 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 ............ !"#
0040 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 $%&'()*+,-./0123
0050 34 35 36 37 4567
Mon May 19 16:36:37 2014 - encap recv:
IP: len 84 184.72.226.23->44.153.0.1 ihl 20 ttl 38 DF prot ICMP
ICMP: type Echo Request id 58952 seq 2
0000 45 00 00 54 33 76 40 00 26 01 5a 39 b8 48 e2 17 E..T3v@.&.Z98Hb.
0010 2c 99 00 01 08 00 38 ce e6 48 00 02 2f 5d 7a 53 ,.....8NfH../]zS
0020 00 00 00 00 6f 63 01 00 00 00 00 00 10 11 12 13 ....oc..........
0030 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 ............ !"#
0040 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 $%&'()*+,-./0123
0050 34 35 36 37 4567
Mon May 19 16:36:37 2014 - encap recv:
IP: len 84 184.72.226.23->44.153.0.1 ihl 20 ttl 38 DF prot ICMP
ICMP: type Echo Request id 58952 seq 3
0000 45 00 00 54 33 77 40 00 26 01 5a 38 b8 48 e2 17 E..T3w@.&.Z88Hb.
0010 2c 99 00 01 08 00 c7 a0 e6 48 00 03 2f 5d 7a 53 ,.....G fH../]zS
0020 00 00 00 00 dd 8f 04 00 00 00 00 00 10 11 12 13 ....]...........
0030 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 ............ !"#
0040 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31 32 33 $%&'()*+,-./0123
0050 34 35 36 37 4567
=======================================================================
Related autoexec.nos commands to routes & interfaces
hostname lu7abf.ampr.org.
ip address 44.153.0.1
ax25 mycall lu7abf
attach tun tun0 1500 0
ifconfig tun0 ipaddress 44.153.0.10
ifconfig tun0 netmask 255.255.255.0
ifconfig tun0 mtu 1500
shell ifconfig tun0 44.153.0.3 pointopoint 44.153.0.10 mtu 1500 up
shell route add 44.153.0.1 gw 44.153.0.3 tun0
shell sudo arp -sD 44.153.0.10 eth0 pub
shell echo 0 > /proc/sys/net/ipv4/conf/tun0/rp_filter # disable arp_filter
shell echo 1 > /proc/sys/net/ipv4/ip_forward # enable ip_forward
shell iptables -t nat -A PREROUTING -d 44.153.0.10/32 --proto 4 \-j DNAT
--to 44.153.0.1
shell iptables -t nat -A PREROUTING -d 44.153.0.10/32 --proto 94 \-j DNAT
--to 44.153.0.1
shell iptables -t nat -A POSTROUTING -s 44.153.0.1/32 -o eth0 -p 4
shell iptables -t nat -A POSTROUTING -s 44.153.0.1/32 -o eth0 -p 94
shell sudo -s iptables -t nat -A PREROUTING -d 44.153.0.3/32 -p tcp --dport
23 \-j DNAT --to 44.153.0.1:23
shell sudo -s iptables -t nat -A PREROUTING -d 44.153.0.3/32 -p tcp --dport
6300 \-j DNAT --to 44.153.0.1:23
shell sudo -s iptables -t nat -A PREROUTING -d lu7abf.org.ar -p tcp --dport
6300 \-j DNAT --to 44.153.0.1:23
shell sudo -s iptables -t nat -A POSTROUTING -s 44.153.0.1/32 -o eth0 -j
MASQUERADE
shell sudo -s iptables -t nat -A POSTROUTING -s 44.153.0.10/32 -o eth0 -j
MASQUERADE
ifconfig encap ip 44.153.0.1
ifconfig encap mtu 1500
ifconfig encap netmask 0xffffffff
ifconfig encap broadcast 255.255.255.255
ifc encap descript "IPIP Encapulation interface"
arp eaves tun0 on
arp eaves encap on
arp poll tun0 on
arp poll encap on
arp maxq 20
route addprivate default tun0 44.153.0.3
route add 44.153.0.1 tun0 44.153.0.10
route add 44.153.0.2 tun0 44.153.0.10
route add 44.153.0.3 tun0 44.153.0.10
========================================================