MTR and UDP packets

Installing and Using OpenWrt
1

I would like to know why when I use UDP instead of ICMP in mtr, my ping is higher and there are also more hosts in the path?

ICMP:

HOST: OpenWrt                                                            Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 192.168.0.1 (192.168.0.1)                                          40.0%    10    1.2   1.2   0.8   1.5   0.2
  2.|-- 100.68.240.1 (100.68.240.1)                                         0.0%    10   13.3   9.3   6.2  14.8   3.2
  3.|-- 189.4.13.69 (189.4.13.69)                                           0.0%    10    6.0   4.9   4.0   6.0   0.7
  4.|-- bd040c32.virtua.com.br (189.4.12.50)                                0.0%    10    4.3   3.2   2.6   4.3   0.5
  5.|-- embratel-H0-2-0-0-4003-agg01.ctanj.embratel.net.br (201.44.213.25)  0.0%    10    4.6   3.4   2.7   4.6   0.5
  6.|-- 200.230.25.161 (200.230.25.161)                                     0.0%    10   30.8  28.7  25.1  32.4   2.5
  7.|-- ebt-B1421-core01.spo.embratel.net.br (200.230.231.62)               0.0%    10   22.3  21.8  20.2  23.8   1.1
  8.|-- ebt-B1101-core01.rjo.embratel.net.br (200.230.251.1)                0.0%    10   21.8  21.3  20.6  22.3   0.6
  9.|-- ebt-B211-agg03.rjo.embratel.net.br (200.244.18.8)                   0.0%    10   22.1  26.2  20.5  64.0  13.4
 10.|-- peer-B54-agg03.rjo.embratel.net.br (201.39.52.58)                   0.0%    10   17.1  17.0  16.2  18.4   0.6
 11.|-- 81.192.95.34.bc.googleusercontent.com (34.95.192.81)                0.0%    10   16.7  16.2  15.6  17.3   0.6

UDP:

HOST: OpenWrt                                               Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 192.168.0.1 (192.168.0.1)                             30.0%    10    1.4   1.3   1.1   1.8   0.2
  2.|-- 100.68.240.1 (100.68.240.1)                            0.0%    10   15.4  13.4   6.6  23.3   4.9
  3.|-- 189.4.13.69 (189.4.13.69)                              0.0%    10    4.8   5.3   4.7   6.3   0.6
  4.|-- bd040c32.virtua.com.br (189.4.12.50)                   0.0%    10    3.0   3.2   2.5   4.0   0.5
  5.|-- 200.227.109.17 (200.227.109.17)                        0.0%    10    3.4   3.7   3.1   5.0   0.6
        embratel-H0-2-0-0-4003-agg01.ctanj.embratel.net.br (201.44.213.25)
        200.227.109.9 (200.227.109.9)
        200.227.108.9 (200.227.108.9)
  6.|-- 200.230.25.163 (200.230.25.163)                        0.0%    10   27.5  29.6  26.0  33.0   2.5
        200.230.25.161 (200.230.25.161)
  7.|-- ebt-B1421-core01.spo.embratel.net.br (200.230.231.62)  0.0%    10   26.7  27.3  25.5  31.3   2.0
        ebt-B10-tcore01.ctamr.embratel.net.br (200.230.231.74)
  8.|-- ebt-B1101-core01.rjo.embratel.net.br (200.230.251.1)   0.0%    10   25.5  26.0  22.0  27.6   1.6
        ebt-B1421-core01.spo.embratel.net.br (200.230.231.62)
  9.|-- ebt-B211-agg03.rjo.embratel.net.br (200.244.18.8)      0.0%    10   25.4  28.9  20.8  59.1  10.7
        ebt-B1101-core01.rjo.embratel.net.br (200.230.251.1)
 10.|-- peer-B54-agg03.rjo.embratel.net.br (201.39.52.58)      0.0%    10   21.2  23.2  16.4  26.3   3.1
        ebt-B211-agg03.rjo.embratel.net.br (200.244.18.8)
 11.|-- peer-B54-agg03.rjo.embratel.net.br (201.39.52.58)     70.0%    10   21.8  22.7  21.8  24.5   1.5
 12.|-- ???                                                   100.0    10    0.0   0.0   0.0   0.0   0.0
1 Like
2

You'd have to ask the owners of the router indicated in the preceeding hop which causes you concern. Also, routers can be configured to prioritize and process ICMP and UDP differently.

3

The 30-40 percent loss on the first hop is alarming.

4

But could you tell me why, for example, in jump 5 there are several IPs, not just 1?

5

Yes.

Because the router in hop 4 has mutiple connections/paths to the routers listed in hop 5.

6

But why does this only happen in udp?

7

Again, recall that you'd need to: