How is edge routing determined?

Questions / Help
1

Hi there,

Apologies if this has been asked before, I couldn’t find a clear answer. I have apps running in SJC and LAX but the latency to either is ~100ms from San Diego. It seems like Fly is typically routing me to IAD. Why might this be?

2

Routing happens via the complicated world of BGP.

Sometimes, for some ISPs, depending on peering between us and then, users may be routed to a sub-optimal location.

Can you provide a traceroute to your app’s IP?

We can usually improve the situation greatly with a few adjustments.

1 Like
3

I appreciate the quick reply!

Here’s the traceroute to the app in SJC.

traceroute to 66.241.124.247 (66.241.124.247), 30 hops max, 60 byte packets
 1  _gateway (192.168.88.1)  7.259 ms  7.428 ms  7.617 ms
 2  10.131.60.1 (10.131.60.1)  18.369 ms  18.498 ms  18.490 ms
 3  100.120.109.144 (100.120.109.144)  15.017 ms  19.080 ms  19.339 ms
 4  100.120.109.103 (100.120.109.103)  20.123 ms  20.423 ms  20.415 ms
 5  mtc3dsrj01-ge708.103.rd.ok.cox.net (68.1.2.29)  69.155 ms  69.148 ms  69.140 ms
 6  75.102.42.5 (75.102.42.5)  96.095 ms  62.636 ms  62.821 ms

The route is the same to LAX.

4

All IPs are advertised the same way, so that makes sense!

I’ll check with the network team. I can’t guarantee a quick improvement given the period of the year we’re in right now :slight_smile:

1 Like
5

Thanks Jerome :slight_smile: Yeah, I totally understand that this is a slow time of year. It’s not critical at all but I am looking at hosting game servers on Fly so I would certainly appreciate lower latencies :sweat_smile:

6

@jerome I had a friend run the same traceroute with a different San Diego based ISP and they’re also routed to the east coast but to a different edge server.

> tracert 66.241.124.247

Tracing route to 66.241.124.247 over a maximum of 30 hops

  1    <1 ms    <1 ms    <1 ms  router.asus.com [192.168.1.1]
  2     8 ms    11 ms     8 ms  142-254-184-209.inf.spectrum.com [142.254.184.209]
  3    10 ms    11 ms    10 ms  lag-59.crlscaij01h.netops.charter.com [76.167.20.33]
  4    15 ms    15 ms    15 ms  lag-33.sndhcaax01r.netops.charter.com [72.129.3.96]
  5    13 ms    13 ms    13 ms  lag-22.lsancarc01r.netops.charter.com [72.129.1.0]
  6    13 ms    16 ms    13 ms  lag-26.lsancarc0yw-bcr00.netops.charter.com [66.109.3.230]
  7    69 ms    63 ms    71 ms  lag-21.tustca4200w-bcr00.netops.charter.com [107.14.19.36]
  8    63 ms    62 ms    61 ms  lag-16.dllstx976iw-bcr00.netops.charter.com [66.109.6.1]
  9    64 ms    63 ms    61 ms  lag-412.hstqtx0209w-bcr00.netops.charter.com [66.109.6.91]
 10    68 ms    64 ms    61 ms  lag-405.atlngamq46w-bcr00.netops.charter.com [66.109.9.28]
 11    70 ms    74 ms    61 ms  lag-303.pr2.atl20.netops.charter.com [66.109.9.105]
 12    62 ms    63 ms    67 ms  be-201-pe11.56marietta.ga.ibone.comcast.net [50.248.119.57]
 13    62 ms    62 ms    64 ms  be-2411-cs04.56marietta.ga.ibone.comcast.net [96.110.32.33]
 14    62 ms    64 ms    61 ms  be-2403-pe03.56marietta.ga.ibone.comcast.net [96.110.37.94]
 15    64 ms    86 ms    63 ms  75.149.228.162
 16    63 ms    63 ms    67 ms  66.241.124.247

Trace complete.

Their ISP is Spectrum and mine is Cox Communications.