I'm trying to setup a poorly designed Wi-Fi device and I've connected to its wifi network and set my IP and routes manually as DHCP does not appear to be working.
# ip route show default via 192.168.10.100 dev wlp2s0b1 src 192.168.10.3 192.168.10.0/24 dev wlp2s0b1 scope link
When I try to
ping 192.168.10.100 (the alleged default IP), the
ping utility shows no output.
tcpdump also shows nothing, though there is activity on the network, and ARP happens occasionally:
17:12:43.147305 ARP, Request who-has gateway tell localhost.localdomain, length 28 17:12:43.148516 ARP, Reply gateway is-at d8:eb:97:a2:3b:fc (oui Unknown), length 28 17:14:15.914295 IP localhost.localdomain.50800 > 184.108.40.206.ssdp: UDP, length 171 17:14:15.921169 IP gateway.ssdp > localhost.localdomain.50800: UDP, length 279 17:14:17.750750 ARP, Request who-has localhost.localdomain tell gateway, length 28 17:14:17.750799 ARP, Reply localhost.localdomain is-at 70:18:8b:06:ba:57 (oui Unknown), length 28
Additionally, if I send pings to a host outside of the subnet,
tcpdump -i wlp2s0b1 shows the following (not in this order, just that it shows the request and response):
17:13:16.989280 IP gateway > localhost.localdomain: ICMP net 192.168.1.1 unreachable, length 92 17:13:17.989237 IP localhost.localdomain > 192.168.1.1: ICMP echo request, id 27888, seq 12, length 64
even though ping shows no output. (?)
How is this behavior possible? What's happening?
Here's my firewall:
# iptables-save # Generated by iptables-save v1.6.0 on Tue Dec 19 17:19:43 2017 *nat :PREROUTING ACCEPT [29:6414] :INPUT ACCEPT [23:5137] :OUTPUT ACCEPT [10380:773373] :POSTROUTING ACCEPT [9239:678321] -A POSTROUTING -p udp -m udp --sport 1500 -j SNAT --to-source :30000 -A POSTROUTING -p udp -m udp --sport 1504 -j SNAT --to-source :30001 COMMIT # Completed on Tue Dec 19 17:19:43 2017 # Generated by iptables-save v1.6.0 on Tue Dec 19 17:19:43 2017 *filter :INPUT ACCEPT [52617:8798972] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [54107:7942732] COMMIT # Completed on Tue Dec 19 17:19:43 2017
tcpdump -i lo does not show any of the packets I'm looking for
EDIT Some updates:
# ip route get 192.168.10.100 192.168.10.100 dev wlp2s0b1 src 192.168.10.3 uid 0 cache # ip addr show wlp2s0b1 3: wlp2s0b1: mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether 70:18:8b:--:--:-- brd ff:ff:ff:ff:ff:ff inet 192.168.10.3/24 brd 192.168.10.255 scope global wlp2s0b1 valid_lft forever preferred_lft forever inet6 fe80::ff1e:167e:8d67:797d/64 scope link valid_lft forever preferred_lft forever
Also, looking at
tcpdump -n, 192.168.10.100 is indeed 'gateway', not sure how that name is getting in there.
UPDATE sorry guys, it is because I was running an IPsec client with local selector containing
192.168.10.0/24. I did not see evidence of this using the
ip utility, including with
ip route show table all but stopping the client released this 'blackhole'. Thanks