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When I ping a static external IP address on my internal network it works half the time directly to the IP address but then half the time it is going to the router address first. Is there some things I can test here to see why it isn't just consistent? I have another external IP address not on that server that pings consistently without going to the router.

Here is the inconsistent ping:

PING 70.88.182.194 (70.88.182.194): 56 data bytes
64 bytes from 70.88.182.194: icmp_seq=0 ttl=63 time=1.834 ms
64 bytes from 70.88.182.194: icmp_seq=1 ttl=63 time=1.846 ms
64 bytes from 70.88.182.194: icmp_seq=2 ttl=64 time=1.128 ms
92 bytes from 10.1.10.1: Redirect Host(New addr: 70.88.182.194)
Vr HL TOS Len ID Flg off TTL Pro cks Src Dst
4 5 00 0054 4ba0 0 0000 3f 01 1e34 10.1.10.186 70.88.182.194

64 bytes from 70.88.182.194: icmp_seq=3 ttl=64 time=1.183 ms
92 bytes from 10.1.10.1: Redirect Host(New addr: 70.88.182.194)
Vr HL TOS Len ID Flg off TTL Pro cks Src Dst
4 5 00 0054 ebb3 0 0000 3f 01 7e20 10.1.10.186 70.88.182.194

64 bytes from 70.88.182.194: icmp_seq=4 ttl=64 time=1.117 ms
92 bytes from 10.1.10.1: Redirect Host(New addr: 70.88.182.194)
Vr HL TOS Len ID Flg off TTL Pro cks Src Dst
4 5 00 0054 b051 0 0000 3f 01 b982 10.1.10.186 70.88.182.194

64 bytes from 70.88.182.194: icmp_seq=5 ttl=64 time=1.154 ms
64 bytes from 70.88.182.194: icmp_seq=6 ttl=64 time=1.133 ms
92 bytes from 10.1.10.1: Redirect Host(New addr: 70.88.182.194)
Vr HL TOS Len ID Flg off TTL Pro cks Src Dst
4 5 00 0054 8411 0 0000 3f 01 e5c2 10.1.10.186 70.88.182.194

64 bytes from 70.88.182.194: icmp_seq=7 ttl=64 time=1.072 ms
64 bytes from 70.88.182.194: icmp_seq=8 ttl=64 time=1.508 ms
64 bytes from 70.88.182.194: icmp_seq=9 ttl=64 time=0.943 ms
92 bytes from 10.1.10.1: Redirect Host(New addr: 70.88.182.194)
Vr HL TOS Len ID Flg off TTL Pro cks Src Dst
4 5 00 0054 ca19 0 0000 3f 01 9fba 10.1.10.186 70.88.182.194

64 bytes from 70.88.182.194: icmp_seq=10 ttl=64 time=2.307 ms
64 bytes from 70.88.182.194: icmp_seq=11 ttl=64 time=0.927 ms
64 bytes from 70.88.182.194: icmp_seq=12 ttl=64 time=0.945 ms
64 bytes from 70.88.182.194: icmp_seq=13 ttl=64 time=3.285 ms

Routing tables

Internet: Destination Gateway Flags Refs Use Netif Expire

default 10.1.10.1 UGSc 456 11 en6
10.1.10/24 link#10 UCS 86 0 en6
10.1.10.1/32 link#10 UCS 3 0 en6
10.1.10.1 78:cd:8e:c7:92:b7 UHLWIir 457 0 en6 1029
10.1.10.2 20:c9:d0:32:9e:19 UHLWIi 1 689 en6 114
10.1.10.5 link#10 UHLWIi 1 0 en6
10.1.10.6 link#10 UHLWIi 1 0 en6
10.1.10.7 link#10 UHLWIi 1 0 en6
10.1.10.8 link#10 UHLWIi 1 419 en6
10.1.10.10 0:c:29:e4:b4:54 UHLWIi 1 0 en6 743
10.1.10.11 link#10 UHLWIi 1 0 en6
10.1.10.13 b8:9:8a:d5:19:1b UHLWIi 1 1483 en6 1068
10.1.10.14 link#10 UHLWIi 1 0 en6
10.1.10.15 d0:df:9a:7e:b2:1e UHLWIi 1 0 en6 1196
10.1.10.16 link#10 UHLWIi 1 0 en6
10.1.10.17 link#10 UHLWIi 1 0 en6
10.1.10.18 link#10 UHLWIi 1 0 en6
10.1.10.20 link#10 UHLWIi 1 9 en6
10.1.10.21 link#10 UHLWIi 1 0 en6
10.1.10.22 link#10 UHLWIi 1 0 en6
10.1.10.23 link#10 UHLWIi 1 0 en6
10.1.10.24 link#10 UHLWIi 1 835 en6
10.1.10.27 link#10 UHLWIi 1 1375 en6
10.1.10.29 link#10 UHLWIi 1 15 en6
10.1.10.30 link#10 UHLWIi 1 0 en6
10.1.10.31 link#10 UHLWIi 1 0 en6
10.1.10.32 ec:b1:d7:f9:eb:d9 UHLWIi 1 0 en6 1194
10.1.10.35 f0:d1:a9:f:28:9c UHLWIi 1 0 en6 742
10.1.10.36 link#10 UHLWIi 1 0 en6
10.1.10.37 link#10 UHLWIi 1 0 en6
10.1.10.40 link#10 UHLWIi 1 0 en6
10.1.10.41 b8:9:8a:da:69:4b UHLWIi 1 1133 en6 38
10.1.10.42 link#10 UHLWIi 1 0 en6
10.1.10.43 link#10 UHLWIi 1 173 en6
10.1.10.44 link#10 UHLWIi 1 0 en6
10.1.10.45 link#10 UHLWIi 1 70 en6
10.1.10.46 link#10 UHLWIi 1 4 en6
10.1.10.47 c8:2a:14:22:cc:47 UHLWIi 1 0 en6 596
10.1.10.48 link#10 UHLWIi 1 0 en6
10.1.10.49 link#10 UHLWIi 1 0 en6
10.1.10.50 link#10 UHLWIi 1 0 en6
10.1.10.52 link#10 UHLWIi 1 1 en6
10.1.10.53 link#10 UHLWIi 1 1241 en6
10.1.10.57 f8:4:2e:2f:e2:1f UHLWIi 1 2282 en6 1198
10.1.10.58 link#10 UHLWIi 1 0 en6
10.1.10.59 link#10 UHLWIi 1 0 en6
10.1.10.62 b8:9:8a:da:a2:dd UHLWIi 1 0 en6 991
10.1.10.63 link#10 UHLWIi 1 0 en6
10.1.10.64 link#10 UHLWIi 1 3 en6
10.1.10.65 link#10 UHLWIi 1 377 en6
10.1.10.66 link#10 UHLWIi 1 2 en6
10.1.10.67 link#10 UHLWIi 1 1865 en6
10.1.10.69 f8:4:2e:2f:e2:48 UHLWIi 1 2290 en6 1199
10.1.10.70 link#10 UHLWIi 1 278 en6
10.1.10.71 link#10 UHLWIi 1 0 en6
10.1.10.74 link#10 UHLWIi 1 30 en6
10.1.10.75 link#10 UHLWIi 1 0 en6
10.1.10.76 link#10 UHLWIi 1 0 en6
10.1.10.77 link#10 UHLWIi 1 44 en6
10.1.10.78 link#10 UHLWIi 1 93 en6
10.1.10.79 f8:4:2e:30:1:9e UHLWIi 1 2217 en6 1200
10.1.10.80 f0:d1:a9:f:28:9c UHLWIi 1 19044 en6 1199
10.1.10.82 link#10 UHLWIi 1 0 en6
10.1.10.83 link#10 UHLWIi 1 2379 en6
10.1.10.85 0:19:f:f:1a:f3 UHLWIi 1 228 en6 1092
10.1.10.87 90:2b:34:a4:f4:76 UHLWIi 1 0 en6 1196
10.1.10.88 2c:27:d7:46:b3:91 UHLWIi 1 0 en6 1199
10.1.10.89 ac:87:a3:27:eb:b7 UHLWIi 1 253 en6 1132
10.1.10.90 link#10 UHLWIi 1 1516 en6
10.1.10.92 link#10 UHLWIi 1 0 en6
10.1.10.93 link#10 UHLWIi 1 0 en6
10.1.10.94 link#10 UHLWIi 1 0 en6
10.1.10.95 link#10 UHLWIi 1 0 en6
10.1.10.96 link#10 UHLWIi 1 0 en6
10.1.10.97 link#10 UHLWIi 1 0 en6
10.1.10.99 link#10 UHLWIi 1 0 en6
10.1.10.100 link#10 UHLWIi 1 0 en6
10.1.10.102 68:94:23:9c:6:59 UHLWIi 1 0 en6 1054
10.1.10.112 90:2:a9:b:a0:89 UHLWIi 1 0 en6 1053
10.1.10.113 90:2:a9:b:a0:7d UHLWIi 1 0 en6 1053
10.1.10.114 90:2:a9:b:a0:76 UHLWIi 1 0 en6 1068
10.1.10.115 90:2:a9:b:a0:6f UHLWIi 1 0 en6 1053
10.1.10.151 40:6c:8f:b8:44:f9 UHLWIi 3 64070 en6 1193
10.1.10.152 link#10 UHLWIi 1 75508 en6
10.1.10.154 a8:20:66:34:9c:57 UHLWIi 5 829447 en6 1200
10.1.10.155 0:c:29:ad:cc:69 UHLWIi 1 1286634 en6 996
10.1.10.186/32 link#10 UCS 2 0 en6
10.1.10.186 98:5a:eb:ca:a4:59 UHLWIi 1 1 lo0
10.1.10.240 0:e0:81:79:d5:70 UHLWIi 1 110 en6 120
10.1.10.248 link#10 UHLWIi 1 0 en6
10.1.10.255 link#10 UHLWbI 1 13902 en6
127 127.0.0.1 UCS 1 0 lo0
127.0.0.1 127.0.0.1 UH 8 553203 lo0
169.254 link#10 UCS 13 0 en6
169.254.56.167 link#10 UHLSW 1 0 en6
169.254.91.253 link#10 UHLSW 1 0 en6
169.254.113.79 link#10 UHLSW 1 0 en6
169.254.132.235 link#10 UHLSW 1 0 en6
169.254.144.221 link#10 UHLSW 1 0 en6
169.254.168.44 link#10 UHLSW 1 0 en6
169.254.178.55 link#10 UHLSW 1 0 en6
169.254.197.234 link#10 UHLSW 1 0 en6
169.254.233.20 link#10 UHLSW 1 0 en6
169.254.237.115 link#10 UHLSW 1 0 en6
169.254.243.228 link#10 UHLSW 1 0 en6
169.254.247.120 link#10 UHLSW 1 0 en6
172.16.58/24 link#13 UC 3 0 vmnet8
172.16.58.255 link#13 UHLWbI 1 13902 vmnet8
172.16.222/24 link#12 UC 3 0 vmnet1
172.16.222.255 link#12 UHLWbI 1 13902 vmnet1
224.0.0 link#10 UmCS 2 0 en6
224.0.0.251 1:0:5e:0:0:fb UHmLWI 1 1364 en6
255.255.255.255/32 link#10 UCS 2 0 en6
255.255.255.255 link#10 UHLWbI 1 10106 en6

chadps:~ chadsims$ networksetup -listallhardwareports

Hardware Port: Display Ethernet
Device: en6
Ethernet Address: 98:5a:eb:ca:a4:59

Hardware Port: Display FireWire
Device: fw0
Ethernet Address: 00:0a:27:02:00:65:ab:29

Hardware Port: Wi-Fi
Device: en0
Ethernet Address: a4:5e:60:e4:66:f1

Hardware Port: Bluetooth PAN
Device: en4
Ethernet Address: a4:5e:60:e4:53:6c

Hardware Port: Thunderbolt 1
Device: en1
Ethernet Address: 6a:00:00:3b:6a:f0

Hardware Port: Thunderbolt 2
Device: en2
Ethernet Address: 6a:00:00:3b:6a:f1

Hardware Port: Thunderbolt Bridge
Device: bridge0
Ethernet Address: a6:5e:60:4e:97:00

VLAN Configurations

Improve this question
8
  • What you are seeing are ICMP redirects however something is odd. ICMP redirects are used to let hosts know if there is a better next hop gateway to a particular destination other than the one they are currently using. In your case, when you ping 70.88.182.194, your (default?) gateway at 10.1.10.1 is saying "to get to 70.88.182.194, you should send packets to 70.88.182.194 as the next hop, rather than me." Can you post the output of your routing table and interface config.
    – Mark Riddell
    Jun 11, 2016 at 13:19
  • What makes this odd, is that the RFC standard says that routers should only send an ICMP redirect when the "better" next-hop gateway (e.g. 70.88.182.194) is in the same subnet as the source IP of the original packet (e.g. 10.1.10.186).
    – Mark Riddell
    Jun 11, 2016 at 13:20
  • We have a strange setup I think because our gw is our router rather than using a separate router. So there may be some routing tables in the gw/router that I can't see but public WAN for the gw is 70.88.182.198 and router is 10.1.10.1 but like I can ping 70.88.182.196 which is not on 70.88.182.197 server and it pings fine. It is only when I try to ping ip addresses within the server that is 70.88.182.197 (local 10.1.10.151) when I have the ICMP issue you are seeing.
    – Chad Sims
    Jun 11, 2016 at 16:13
  • Sorry, but I'm confused about where these servers sit on your network - a quick network diagram may help. Correct me if I'm wrong: the device that you are testing from is 10.1.10.186 and the internal IP of your default gateway is 10.1.10.1. The public IP of your default gateway is 70.88.182.198. Where do the servers sit? It sounds like they sit on the same subnet as your PC however I'm unclear how they each get a public IP - do they don't use 10.1.10.1 as their default gateway?
    – Mark Riddell
    Jun 11, 2016 at 17:05
  • dropbox.com/s/u8kasejdkkvu9bs/…
    – Chad Sims
    Jun 11, 2016 at 17:34

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