[44net] Re: Fw: Re: UCSD gateway not responding after router reboot?

I have similar experience with the gateway recently. Once I reboot my

________________________________ From: Dan Cross via 44net &lt;44net(a)mailman.ampr.org&gt; Sent: Thursday, May 2, 2024 9:01 To: AMPRNet working group &lt;44net(a)mailman.ampr.org&gt; Subject: [44net] UCSD gateway not responding after router reboot? I rebooted my AMPRNet router after an upgrade earlier today, and now IPENCAP traffic doesn't seem to be flowing through the UCSD gateway. I wonder if this is expected behavior? I've verified that all interfaces on the router are working as expected: I can ping the _external_ address of the UCSD gateway from my router's external interface: ``` marconi# ping -V 23 -I 23.30.150.141 169.228.34.84 PING 169.228.34.84 (169.228.34.84): 56 data bytes 64 bytes from 169.228.34.84: icmp_seq=0 ttl=48 time=86.937 ms 64 bytes from 169.228.34.84: icmp_seq=1 ttl=48 time=85.409 ms 64 bytes from 169.228.34.84: icmp_seq=2 ttl=48 time=90.166 ms 64 bytes from 169.228.34.84: icmp_seq=3 ttl=48 time=90.180 ms 64 bytes from 169.228.34.84: icmp_seq=4 ttl=48 time=82.058 ms 64 bytes from 169.228.34.84: icmp_seq=5 ttl=48 time=83.595 ms ^C --- 169.228.34.84 ping statistics --- 6 packets transmitted, 6 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 82.058/86.391/90.180/3.067 ms marconi# ``` But suppose I try to `ping` an external IPv4 address from a machine inside of my subnet. Then those messages seem to be dropped. E.g., dumping on the encap interface: ``` tcpdump: listening on gif1, link-type LOOP 15:51:46.955189 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:507) [icmp cksum ok] (ttl 254, id 62634, len 84) 15:51:46.975585 44.44.48.29.34992 > 152.70.159.102.123: [udp sum ok] v4 client strat 0 poll 0 prec 0 dist 0.000000 disp 0.000000 ref (unspec)(a)0.000000000 orig 0.000000000 rec -0.000000000 xmt -501608111.378157913 [tos 0x10] (ttl 63, id 42418, len 76) 15:51:47.955108 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:508) [icmp cksum ok] (ttl 254, id 6160, len 84) 15:51:48.953556 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:509) [icmp cksum ok] (ttl 254, id 5705, len 84) 15:51:49.955095 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:510) [icmp cksum ok] (ttl 254, id 38617, len 84) 15:51:50.955135 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:511) [icmp cksum ok] (ttl 254, id 13652, len 84) 15:51:51.953550 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:512) [icmp cksum ok] (ttl 254, id 15767, len 84) ^C 8 packets received by filter 0 packets dropped by kernel ``` (Note: the UDP packet is just an NTP request on the machine that happens to be running `ping`, but it's unrelated.) I can see that such packets are being routed out of my external interface, while properly encapsulated. e.g., ``` tcpdump: listening on cnmac1, link-type EN10MB 15:52:14.955137 23.30.150.141 > 169.228.34.84: 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:535) (ttl 254, id 35282, len 84) (ttl 64, id 61599, len 104) 15:52:15.335038 35.203.211.24.57286 > 23.30.150.141.999: S [tcp sum ok] 4102707815:4102707815(0) win 65535 <mss 1460> [tos 0x20] (ttl 56, id 54321, len 44) 15:52:15.335165 23.30.150.141.999 > 35.203.211.24.57286: R [bad tcp cksum a4a9! -> d8a0] 0:0(0) ack 4102707816 win 0 (DF) [tos 0x10] (ttl 64, id 61784, len 40) 15:52:15.955143 23.30.150.141 > 169.228.34.84: 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:536) (ttl 254, id 27600, len 84) (ttl 64, id 37135, len 104) 15:52:16.955121 23.30.150.141 > 169.228.34.84: 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:537) (ttl 254, id 62216, len 84) (ttl 64, id 5987, len 104) 15:52:17.025154 23.30.150.141 > 169.228.34.84: 44.44.48.29.6711 > 152.70.159.102.123: [udp sum ok] v4 client strat 0 poll 0 prec 0 dist 0.000000 disp 0.000000 ref (unspec)(a)0.000000000 orig 0.000000000 rec -0.000000000 xmt +824494743.794610023 [tos 0x10] (ttl 63, id 64906, len 76) [tos 0x10] (ttl 64, id 14623, len 96) 15:52:17.955195 23.30.150.141 > 169.228.34.84: 44.44.48.29 > 142.250.80.4: icmp: echo request (id:cf3d seq:538) (ttl 254, id 59942, len 84) (ttl 64, id 39191, len 104) ^C 20 packets received by filter 0 packets dropped by kernel ``` However, if I try to `ping` a machine I own elsewhere on the network where I can run `tcpdump`, the traffic never seems to get there. Further, I can `ping` my external interface from elsewhere on the network. That all appears to be working. IPv6 works, so I'm fairly confident in e.g. my firewall rules and so on. Curiously, I am receiving RIP packets from 44.0.0.1 on the multicast group, and I can `ping` other machines inside the AMPRNet mesh, but this all strongly implies that the UCSD gateway is dropping traffic to and from my subnet. Is that expected? Thanks! - Dan C. (KZ2X) _______________________________________________ 44net mailing list -- 44net(a)mailman.ampr.org To unsubscribe send an email to 44net-leave(a)mailman.ampr.org