Коммутатор DES-3550.
Прошивка 5.01.B65.
Конфиг сброшен на дефолт.
Подключен на прямую в сетевую карту компа.
Что мы видим.

64 bytes from (192.168.4.64): icmp_req=1 ttl=30 time=4.28 ms
64 bytes from (192.168.4.64): icmp_req=2 ttl=30 time=2.31 ms
64 bytes from (192.168.4.64): icmp_req=3 ttl=30 time=6.51 ms
64 bytes from (192.168.4.64): icmp_req=4 ttl=30 time=42.2 ms
64 bytes from (192.168.4.64): icmp_req=5 ttl=30 time=2.45 ms
64 bytes from (192.168.4.64): icmp_req=6 ttl=30 time=2.79 ms
64 bytes from (192.168.4.64): icmp_req=7 ttl=30 time=2.49 ms
64 bytes from (192.168.4.64): icmp_req=8 ttl=30 time=2.36 ms
64 bytes from (192.168.4.64): icmp_req=9 ttl=30 time=2.67 ms
64 bytes from (192.168.4.64): icmp_req=10 ttl=30 time=2.25 ms
64 bytes from (192.168.4.64): icmp_req=11 ttl=30 time=2.63 ms
64 bytes from (192.168.4.64): icmp_req=12 ttl=30 time=2.69 ms
64 bytes from (192.168.4.64): icmp_req=13 ttl=30 time=2.57 ms
64 bytes from (192.168.4.64): icmp_req=14 ttl=30 time=22.1 ms
64 bytes from (192.168.4.64): icmp_req=15 ttl=30 time=18.1 ms
64 bytes from (192.168.4.64): icmp_req=16 ttl=30 time=2.70 ms
64 bytes from (192.168.4.64): icmp_req=17 ttl=30 time=2.40 ms
64 bytes from (192.168.4.64): icmp_req=18 ttl=30 time=2.62 ms
64 bytes from (192.168.4.64): icmp_req=19 ttl=30 time=2.72 ms
64 bytes from (192.168.4.64): icmp_req=20 ttl=30 time=2.60 ms
64 bytes from (192.168.4.64): icmp_req=21 ttl=30 time=3.53 ms
64 bytes from (192.168.4.64): icmp_req=22 ttl=30 time=2.66 ms
64 bytes from (192.168.4.64): icmp_req=23 ttl=30 time=2.58 ms
64 bytes from (192.168.4.64): icmp_req=24 ttl=30 time=2.77 ms
64 bytes from (192.168.4.64): icmp_req=25 ttl=30 time=2.51 ms
64 bytes from (192.168.4.64): icmp_req=26 ttl=30 time=2.69 ms
64 bytes from (192.168.4.64): icmp_req=27 ttl=30 time=2.57 ms
64 bytes from (192.168.4.64): icmp_req=28 ttl=30 time=2.33 ms
64 bytes from (192.168.4.64): icmp_req=29 ttl=30 time=2.43 ms
64 bytes from (192.168.4.64): icmp_req=30 ttl=30 time=3.12 ms
64 bytes from (192.168.4.64): icmp_req=31 ttl=30 time=2.96 ms
64 bytes from (192.168.4.64): icmp_req=32 ttl=30 time=2.55 ms
64 bytes from (192.168.4.64): icmp_req=33 ttl=30 time=38.4 ms
64 bytes from (192.168.4.64): icmp_req=34 ttl=30 time=2.60 ms
64 bytes from (192.168.4.64): icmp_req=35 ttl=30 time=2.36 ms
64 bytes from (192.168.4.64): icmp_req=36 ttl=30 time=2.59 ms
64 bytes from (192.168.4.64): icmp_req=37 ttl=30 time=2.32 ms
64 bytes from (192.168.4.64): icmp_req=38 ttl=30 time=7.80 ms
64 bytes from (192.168.4.64): icmp_req=39 ttl=30 time=6.35 ms
64 bytes from (192.168.4.64): icmp_req=40 ttl=30 time=2.69 ms
64 bytes from (192.168.4.64): icmp_req=41 ttl=30 time=2.37 ms
64 bytes from (192.168.4.64): icmp_req=42 ttl=30 time=16.8 ms
64 bytes from (192.168.4.64): icmp_req=43 ttl=30 time=2.64 ms
64 bytes from (192.168.4.64): icmp_req=44 ttl=30 time=2.45 ms
64 bytes from (192.168.4.64): icmp_req=45 ttl=30 time=2.23 ms
^C
--- x929-1.omgpu.ru ping statistics ---
45 packets transmitted, 45 received, 0% packet loss, time 44053ms
rtt min/avg/max/mdev = 2.231/5.693/42.297/8.587 ms

Это нормально?

Что это?

мало согласуется с

Учитывая общую и тормознутость данной модели - это нормально.
Советую обновить прошивку (viewtopic.php?f=2&t=92700), а то у вас старая совсем.

Ещё советы по использованию:
не включайте dhcp_local_relay - свич сдохнет практически сразу.

А что непонятного? Пинги с unix машины.

Настроен только ip.

Если это пинг с вашей машины до управляющего интерфейса коммутатора - то это нормально.