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tech:network:cisco:icmp-redirects:icmp-redirects
ICMP Redirects
ICMP Redirects
R1>en
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#ip red
R1(config)#ip redi
R1(config)#ip redi
R1(config)#ip redi
R1(config)#ip redi
R1(config)#int f0/0
R1(config-if)#ip red
R1(config-if)#do sh run | i ip redirect
R1(config-if)#do sh run all | i ip redirect
ip redirects
ip redirects
ip redirects
R1(config-if)#no ip redi
R1(config-if)#no ip redirects
R1(config-if)#do sh run all | i ip redirect
no ip redirects
ip redirects
ip redirects
R1(config-if)#ip redirects
R1(config-if)#^Z
R1#
*Sep 24 10:45:53.035: %SYS-5-CONFIG_I: Configured from console by console
R1#en
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#!
R1(config)#int f0/0
R1(config-if)#ip address 172.16.3.3 255.255.255.0
R1(config-if)#no shut
R1(config-if)#exit
R1(config)#int f0/1
R1(config-if)#ip address 172.16.2.1 255.255.255.0
R1(config-if)#standby 2 ip 172.16.2.254
R1(config-if)#standby 2 priority 110
R1(config-if)#standby 2 preempt
R1(config-if)#no shut
R1(config-if)#exit
R1(config)#!
R1(config)#router ospf 1
R1(config-router)#network 172.16.0.0 0.0.255.255 area 0
R1(config-router)#exit
R1(config)#!
R1(config)#end
R1#
*Sep 24 10:45:56.719: %SYS-5-CONFIG_I: Configured from console by console
R1#
*Sep 24 10:45:59.483: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
*Sep 24 10:45:59.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
R1#do sh run all | i ip redirects
^
% Invalid input detected at '^' marker.
R1#do sh run all | i ip redirect
*Sep 24 10:46:20.155: %HSRP-5-STATECHANGE: FastEthernet0/1 Grp 2 state Standby -> Active
R1#sh run all | i ip redirect
ip redirects
ip redirects
ip redirects
R1#
*Sep 24 10:46:46.763: %OSPF-5-ADJCHG: Process 1, Nbr 172.16.4.4 on FastEthernet0/1 from LOADING to FULL, Loading Done
R1#sh run all | i ip redirect
ip redirects
ip redirects
ip redirects
R1#sh run int f0/1
Building configuration...
Current configuration : 165 bytes
!
interface FastEthernet0/1
ip address 172.16.2.1 255.255.255.0
standby 2 ip 172.16.2.254
standby 2 priority 110
standby 2 preempt
duplex auto
speed auto
end
R1#
Full Configuration here.
- ASW1
en conf t ! vlan 1 exit ! int range f0/1 - 2 switchport mode access switchport access vlan 1 spanning-tree portfast no shut exit !Reserved int f0/8 switchport mode access switchport access vlan 1 spanning-tree portfast no shut exit int gig0/1 switchport mode access switchport access vlan 1 spanning-tree portfast no shut exit ! end
- R1
en conf t ! int f0/0 ip address 172.16.1.1 255.255.255.0 no shut exit int f0/1 ip address 172.16.2.1 255.255.255.0 no shut exit ! router ospf 1 network 172.16.0.0 0.0.255.255 area 0 exit ! end
- R2
en conf t ! int f0/0 ip address 172.16.1.2 255.255.255.0 no shut exit int f0/1 ip address 172.16.3.2 255.255.255.0 no shut exit ! router ospf 1 network 172.16.0.0 0.0.255.255 area 0 exit ! end
- PC1
route add 172.16.0.0 mask 255.255.0.0 172.16.1.1 metric 1 if 26
- PC2
sudo ip route add 172.16.0.0/16 via 172.16.3.2
- PC3(ASW3)
As a simple IP terminal.
en conf t ! no cdp run no spanning-tree vlan 1-4094 spanning-tree portfast default ! int vlan 1 ip addr 172.16.2.23 255.255.255.0 no shut exit ! ip default-gateway 172.16.2.1 ! end
✘╹◡╹✘ 18-09-29 19:40:35 /home/wnoguchi
% sudo vim /etc/network/interfaces
✘╹◡╹✘ 18-09-29 19:41:08 /home/wnoguchi
% sudo systemctl restart networking.service
✘╹◡╹✘ 18-09-29 19:41:21 /home/wnoguchi
%
✘╹◡╹✘ 18-09-29 19:41:22 /home/wnoguchi
%
✘╹◡╹✘ 18-09-29 19:41:22 /home/wnoguchi
%
✘╹◡╹✘ 18-09-29 19:41:22 /home/wnoguchi
%
✘╹◡╹✘ 18-09-29 19:41:22 /home/wnoguchi
% ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether f4:30:b9:3c:99:56 brd ff:ff:ff:ff:ff:ff
inet 10.0.1.128/24 brd 10.0.1.255 scope global noprefixroute enp3s0
valid_lft forever preferred_lft forever
inet6 fe80::de50:dd15:552c:9161/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: enx84afec739c0a: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
link/ether 84:af:ec:73:9c:0a brd ff:ff:ff:ff:ff:ff
inet 172.16.2.245/24 brd 172.16.2.255 scope global enx84afec739c0a
valid_lft forever preferred_lft forever
inet 172.16.3.245/24 brd 172.16.3.255 scope global enx84afec739c0a
valid_lft forever preferred_lft forever
4: wlo1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:67:a2:29:00:68 brd ff:ff:ff:ff:ff:ff
✘╹◡╹✘ 18-09-29 19:41:33 /home/wnoguchi
% sudo ip addr del 172.16.2.245/24 dev enx84afec739c0a
✘╹◡╹✘ 18-09-29 19:42:04 /home/wnoguchi
% ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether f4:30:b9:3c:99:56 brd ff:ff:ff:ff:ff:ff
inet 10.0.1.128/24 brd 10.0.1.255 scope global noprefixroute enp3s0
valid_lft forever preferred_lft forever
inet6 fe80::de50:dd15:552c:9161/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: enx84afec739c0a: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
link/ether 84:af:ec:73:9c:0a brd ff:ff:ff:ff:ff:ff
inet 172.16.3.245/24 brd 172.16.3.255 scope global enx84afec739c0a
valid_lft forever preferred_lft forever
4: wlo1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:67:a2:29:00:68 brd ff:ff:ff:ff:ff:ff
✘╹◡╹✘ 18-09-29 19:42:07 /home/wnoguchi
% ip ro | fgrep 172.16.
172.16.3.0/24 dev enx84afec739c0a proto kernel scope link src 172.16.3.245 linkdown
✘╹◡╹✘ 18-09-29 19:43:08 /home/wnoguchi
% sudo ip route add 172.16.0.0/16 via 172.16.3.3
✘╹◡╹✘ 18-09-29 19:43:35 /home/wnoguchi
% ip ro | fgrep 172.16.
172.16.0.0/16 via 172.16.3.3 dev enx84afec739c0a linkdown
172.16.3.0/24 dev enx84afec739c0a proto kernel scope link src 172.16.3.245 linkdown
C:\WINDOWS\system32>route print | findstr 172.16.0
172.16.0.0 255.255.0.0 172.16.1.1 172.16.1.10 26
C:\WINDOWS\system32>ping 172.16.2.23
Pinging 172.16.2.23 with 32 bytes of data:
Request timed out.
Reply from 172.16.2.23: bytes=32 time=1ms TTL=254
Reply from 172.16.2.23: bytes=32 time=1ms TTL=254
Reply from 172.16.2.23: bytes=32 time=1ms TTL=254
Ping statistics for 172.16.2.23:
Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 1ms, Average = 1ms
C:\WINDOWS\system32>route print | findstr 172.16.0
172.16.0.0 255.255.0.0 172.16.1.1 172.16.1.10 26
C:\WINDOWS\system32>ping 172.16.3.245
Pinging 172.16.3.245 with 32 bytes of data:
Reply from 172.16.3.1: Destination host unreachable.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 172.16.3.245:
Packets: Sent = 4, Received = 1, Lost = 3 (75% loss),
C:\WINDOWS\system32>ping 172.16.3.245
Pinging 172.16.3.245 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 172.16.3.245:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
C:\WINDOWS\system32>route print | findstr 172.16.0
172.16.0.0 255.255.0.0 172.16.1.1 172.16.1.10 26
R1#
*Sep 29 10:50:11.346: %OSPF-5-ADJCHG: Process 1, Nbr 172.16.3.2 on FastEthernet0/0 from LOADING to FULL, Loading Done
R1#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
C 172.16.1.0/24 is directly connected, FastEthernet0/0
L 172.16.1.1/32 is directly connected, FastEthernet0/0
C 172.16.2.0/24 is directly connected, FastEthernet0/1
L 172.16.2.1/32 is directly connected, FastEthernet0/1
O 172.16.3.0/24 [110/2] via 172.16.1.2, 01:06:28, FastEthernet0/0
R2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
C 172.16.1.0/24 is directly connected, FastEthernet0/0
L 172.16.1.2/32 is directly connected, FastEthernet0/0
O 172.16.2.0/24 [110/2] via 172.16.1.1, 01:06:36, FastEthernet0/0
C 172.16.3.0/24 is directly connected, FastEthernet0/1
L 172.16.3.2/32 is directly connected, FastEthernet0/1
R1#ping 172.16.3.245 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.3.245, timeout is 2 seconds: ..... Success rate is 0 percent (0/5)
R2#ping 172.16.3.245 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.3.245, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
R1#ping 172.16.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.1.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
R2#ping 172.16.2.23 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.2.23, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
✘╹◡╹✘ 18-09-29 19:43:40 /home/wnoguchi % ip ro | fgrep 172.16. 172.16.0.0/16 via 172.16.3.3 dev enx84afec739c0a 172.16.3.0/24 dev enx84afec739c0a proto kernel scope link src 172.16.3.245 ✘╹◡╹✘ 18-09-29 21:10:31 /home/wnoguchi % ping 172.16.3.3 -c4 PING 172.16.3.3 (172.16.3.3) 56(84) bytes of data. From 172.16.3.245 icmp_seq=1 Destination Host Unreachable From 172.16.3.245 icmp_seq=2 Destination Host Unreachable From 172.16.3.245 icmp_seq=3 Destination Host Unreachable From 172.16.3.245 icmp_seq=4 Destination Host Unreachable --- 172.16.3.3 ping statistics --- 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3070ms pipe 4 ✘╹◡╹✘ 18-09-29 21:11:49 /home/wnoguchi % ping 172.16.3.3 -c4 PING 172.16.3.3 (172.16.3.3) 56(84) bytes of data. From 172.16.3.245 icmp_seq=1 Destination Host Unreachable From 172.16.3.245 icmp_seq=2 Destination Host Unreachable From 172.16.3.245 icmp_seq=3 Destination Host Unreachable From 172.16.3.245 icmp_seq=4 Destination Host Unreachable --- 172.16.3.3 ping statistics --- 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3064ms pipe 4
Wrong route gateway address on PC2 …
- PC2
sudo ip route del 172.16.0.0/16 via 172.16.3.3 sudo ip route add 172.16.0.0/16 via 172.16.3.2
✘╹◡╹✘ 18-09-29 21:11:57 /home/wnoguchi % sudo ip route del 172.16.0.0/16 via 172.16.3.3 ✘╹◡╹✘ 18-09-29 21:15:31 /home/wnoguchi % sudo ip route add 172.16.0.0/16 via 172.16.3.2 ✘╹◡╹✘ 18-09-29 21:15:35 /home/wnoguchi % ip ro | fgrep 172.16. 172.16.0.0/16 via 172.16.3.2 dev enx84afec739c0a 172.16.3.0/24 dev enx84afec739c0a proto kernel scope link src 172.16.3.245 ✘╹◡╹✘ 18-09-29 21:15:54 /home/wnoguchi % ping 172.16.3.2 PING 172.16.3.2 (172.16.3.2) 56(84) bytes of data. 64 bytes from 172.16.3.2: icmp_seq=1 ttl=255 time=1.17 ms 64 bytes from 172.16.3.2: icmp_seq=2 ttl=255 time=1.05 ms 64 bytes from 172.16.3.2: icmp_seq=3 ttl=255 time=1.07 ms ^C --- 172.16.3.2 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 1.057/1.103/1.174/0.050 ms ✘╹◡╹✘ 18-09-29 21:16:06 /home/wnoguchi % ping 172.16.2.23 PING 172.16.2.23 (172.16.2.23) 56(84) bytes of data. 64 bytes from 172.16.2.23: icmp_seq=1 ttl=253 time=1.85 ms 64 bytes from 172.16.2.23: icmp_seq=2 ttl=253 time=1.94 ms ^C --- 172.16.2.23 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 1.854/1.897/1.940/0.043 ms
C:\WINDOWS\system32>ping 172.16.3.245
Pinging 172.16.3.245 with 32 bytes of data:
Reply from 172.16.3.245: bytes=32 time=1ms TTL=63
Reply from 172.16.3.245: bytes=32 time=1ms TTL=63
Reply from 172.16.3.245: bytes=32 time=2ms TTL=63
Reply from 172.16.3.245: bytes=32 time=1ms TTL=63
Ping statistics for 172.16.3.245:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 2ms, Average = 1ms
C:\WINDOWS\system32>route print | findstr 172.16.0
172.16.0.0 255.255.0.0 172.16.1.1 172.16.1.10 26
ICMP redirect observed, but no route added.
Disable Firewall rule temporarily.
C:\WINDOWS\system32>ping 172.16.3.245
Pinging 172.16.3.245 with 32 bytes of data:
Reply from 172.16.3.245: bytes=32 time=1ms TTL=63
Reply from 172.16.3.245: bytes=32 time=1ms TTL=63
Reply from 172.16.3.245: bytes=32 time=2ms TTL=63
Reply from 172.16.3.245: bytes=32 time=1ms TTL=63
Ping statistics for 172.16.3.245:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 2ms, Average = 1ms
C:\WINDOWS\system32>route print | findstr 172.16.0
172.16.0.0 255.255.0.0 172.16.1.1 172.16.1.10 26
WSL same
wnoguchi@LASTHOPE-WIN:~$ ping 172.16.2.23 -c4 PING 172.16.2.23 (172.16.2.23) 56(84) bytes of data. 64 bytes from 172.16.2.23: icmp_seq=1 ttl=254 time=1.96 ms 64 bytes from 172.16.2.23: icmp_seq=2 ttl=254 time=2.08 ms 64 bytes from 172.16.2.23: icmp_seq=3 ttl=254 time=2.14 ms 64 bytes from 172.16.2.23: icmp_seq=4 ttl=254 time=2.09 ms --- 172.16.2.23 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 1.963/2.071/2.144/0.073 ms wnoguchi@LASTHOPE-WIN:~$ ping 172.16.3.245 -c4 PING 172.16.3.245 (172.16.3.245) 56(84) bytes of data. 64 bytes from 172.16.3.245: icmp_seq=1 ttl=63 time=2.03 ms 64 bytes from 172.16.3.245: icmp_seq=2 ttl=63 time=1.41 ms 64 bytes from 172.16.3.245: icmp_seq=3 ttl=63 time=2.43 ms 64 bytes from 172.16.3.245: icmp_seq=4 ttl=63 time=1.21 ms --- 172.16.3.245 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3002ms rtt min/avg/max/mdev = 1.216/1.776/2.439/0.489 ms
still seems incorrect behavior.
disable all ESET protection for a 10 minutes.
works fine, but no temporary route printed. → wrong filter string…
C:\Users\wnogu>route print | findstr 172.16.3
172.16.3.0 255.255.255.0 On-link 172.16.3.1 291
172.16.3.1 255.255.255.255 On-link 172.16.3.1 291
172.16.3.255 255.255.255.255 On-link 172.16.3.1 291
224.0.0.0 240.0.0.0 On-link 172.16.3.1 291
255.255.255.255 255.255.255.255 On-link 172.16.3.1 291
before redirect.
after redirect.
Destination MAC address changed.
Linux verification.
linux - How to accept ICMP redirects? - Unix & Linux Stack Exchange
68 vim /etc/network/interfaces 69 reboot 70 ip add 71 ip addr del 172.16.2.250/24 dev eth0 72 ip a 73 ip addr add 172.16.1.11/24 dev eth0 74 ip a s 75 ip ro 76 ping 172.16.1.1 77 ping 172.16.1.2 78 ping 172.16.2.23 79 ip ro 80 ip ro add default via 172.16.1.1 81 ip ro 82 ping 172.16.2.23 83 ping 172.16.3.245 84 ip ro 85 ping 172.16.3.245 86 ip ro a 87 ip ro --all 88 ip ro -a 89 ip ro dynamic 90 sysctl -a | fgrep accept_redirects 91 ping 172.16.3.245 92 ping 172.16.3.245 93 traceroute 172.16.3.245 94 ping 172.16.3.245 95 ip -d route 96 ping 172.16.3.245 97 ip -d route 98 sysctl -a | fgrep secure_redi 99 ping 172.16.3.245 100 man ip 101 man ip-route 102 ip ro --help 103 ip ro help 104 ip ro show help 105 ip ro show 106 ping 172.16.3.245 107 ping -d 172.16.3.245 108 ip -d ro show 109 ip -d ro show 110 ping -d 172.16.3.245 111 ping 172.16.3.245 112 sysctl -a | fgrep secure_redi 113 echo -n 0 >/proc/sys/net/ipv4/conf/all/secure_redirects 114 ping 172.16.3.245 115 ping 172.16.3.245 116 sysctl -a | fgrep secure_redi 117 ip -d ro show 118 ip ro show cache 119 ip ro show cache 172.16.2.245 120 ping 172.16.3.245 121 ip ro show cache 172.16.2.245 122 exit 123 history
root@raspberrypi:~# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether b8:27:eb:1f:45:00 brd ff:ff:ff:ff:ff:ff
inet 172.16.1.11/24 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::a0b2:82c4:44bb:bfd6/64 scope link
valid_lft forever preferred_lft forever
root@raspberrypi:~# uname -a
Linux raspberrypi 4.1.19-v7+ #858 SMP Tue Mar 15 15:56:00 GMT 2016 armv7l GNU/Linux
root@raspberrypi:~# ping 172.16.3.245 -c10
PING 172.16.3.245 (172.16.3.245) 56(84) bytes of data.
From 172.16.1.1: icmp_seq=1 Redirect Host(New nexthop: 172.16.1.2)
64 bytes from 172.16.3.245: icmp_seq=1 ttl=63 time=1.86 ms
64 bytes from 172.16.3.245: icmp_seq=2 ttl=63 time=0.926 ms
64 bytes from 172.16.3.245: icmp_seq=3 ttl=63 time=0.923 ms
64 bytes from 172.16.3.245: icmp_seq=4 ttl=63 time=0.987 ms
64 bytes from 172.16.3.245: icmp_seq=5 ttl=63 time=0.835 ms
64 bytes from 172.16.3.245: icmp_seq=6 ttl=63 time=0.875 ms
64 bytes from 172.16.3.245: icmp_seq=7 ttl=63 time=0.844 ms
64 bytes from 172.16.3.245: icmp_seq=8 ttl=63 time=0.933 ms
64 bytes from 172.16.3.245: icmp_seq=9 ttl=63 time=0.886 ms
64 bytes from 172.16.3.245: icmp_seq=10 ttl=63 time=0.839 ms
--- 172.16.3.245 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9010ms
rtt min/avg/max/mdev = 0.835/0.991/1.865/0.295 ms
root@raspberrypi:~# ping 172.16.3.245 -c3
PING 172.16.3.245 (172.16.3.245) 56(84) bytes of data.
64 bytes from 172.16.3.245: icmp_seq=1 ttl=63 time=0.853 ms
64 bytes from 172.16.3.245: icmp_seq=2 ttl=63 time=0.840 ms
64 bytes from 172.16.3.245: icmp_seq=3 ttl=63 time=0.815 ms
--- 172.16.3.245 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.815/0.836/0.853/0.015 ms
root@raspberrypi:~# ip route show
default via 172.16.1.1 dev eth0
172.16.1.0/24 dev eth0 proto kernel scope link src 172.16.1.11
root@raspberrypi:~# ip -d route show
unicast default via 172.16.1.1 dev eth0 proto boot scope global
unicast 172.16.1.0/24 dev eth0 proto kernel scope link src 172.16.1.11
Hmm…
References
tech/network/cisco/icmp-redirects/icmp-redirects.txt · Last modified: 2018/09/29 22:52 by wnoguchi
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