On Thu, Jun 20, 2019 at 07:05:57PM +0000, Victor Camacho wrote: > Hi, > > Using OpenBSD 6.4 and I wanted to run some alias ip addresses on one of the > interfaces. > My question is, can I use a different network as an alias? > > Example: > fw3# more hostname.bge0 > inet 10.2.0.1 255.255.0.0 > inet alias 10.2.1.1 255.255.255.255 > inet alias 10.2.2.1 255.255.255.255 > inet alias 10.2.4.1 255.255.255.255 > inet alias 10.2.6.1 255.255.255.255 > inet alias 172.17.11.1 255.255.255.255 > > I am having a problem pinging on the 172.17.11.0 network. > Ping 172.17.11.1 > Responds, but nothing else on the network. > I saw one thing on the internet that said 'alias' has to be on the same > network, but this was not specific as far as age and what operating system. > To me a router, routes. > Any clarification or better way to handle this would be appreciated. >
You need to add the 172.17.11.1 with the correct netmask. The 255.255.255.255 netmask will not allow it to see any other system on that net. The 255.255.255.255 netmask should only be used for additional IPs that are already covered by an other IP address on that interface. Because of this outgoing traffic will use 10.2.0.1 as local IP address an not one of the other (10.2.1.1, 10.2.2.1, ...) unless explicitly bound. When using two different networks on the same interface just configure them the usual way (alias is just telling ifconfig not to replace the first IP address on the interface and instead add another one). > Here is the routing table (with public ip and mac addresses changed or > obscured): > > fw3# route -n show > Routing tables > > Internet: > Destination Gateway Flags Refs Use Mtu Prio Iface > default x.x.x.109 UGS 261 23105124 - 8 dc0 > 224/4 127.0.0.1 URS 0 0 32768 8 lo0 > 10.2/16 10.2.0.1 UCn 31 3623 - 4 bge0 > 10.2.0.1 00:16:41:ed:dd:47 UHLl 0 26952 - 1 bge0 > 10.2.1.1 00:16:41:ed:dd:47 UHLl 0 175419 - 1 bge0 > 10.2.1.1/32 10.2.1.1 UCn 0 0 - 4 bge0 > 10.2.1.11 b4:fb:e4:2c:5b:4d UHLc 0 249998 - 3 bge0 > 10.2.1.200 e8:36:17:6e:89:67 UHLc 0 3730 - 3 bge0 > 10.2.1.207 d0:d2:b0:0c:b9:41 UHLc 0 149944 - 3 bge0 > 10.2.1.208 38:89:2c:dd:5c:37 UHLc 0 179441 - 3 bge0 > 10.2.1.213 34:08:bc:be:3f:c6 UHLc 0 39991 - 3 bge0 > 10.2.1.217 4c:57:ca:08:33:c8 UHLc 0 6704 - 3 bge0 > 10.2.1.221 b0:c0:90:4b:8c:f8 UHLc 1 1299001 - 3 bge0 > 10.2.1.226 78:8a:20:d6:e7:b8 UHLc 0 3626 - 3 bge0 > 10.2.1.243 64:c7:53:aa:68:85 UHLc 0 3720 - 3 bge0 > 10.2.1.245 28:ff:3c:52:6a:51 UHLc 0 171234 - 3 bge0 > 10.2.2.1 00:16:41:ed:dd:47 UHLl 0 46132 - 1 bge0 > 10.2.2.1/32 10.2.2.1 UCn 0 0 - 4 bge0 > 10.2.2.21 ec:b1:d7:f3:09:a9 UHLc 1 252761 - 3 bge0 > 10.2.2.31 ac:1f:6b:96:38:96 UHLc 1 11629 - 3 bge0 > 10.2.2.61 9c:93:4e:5c:b7:9e UHLc 0 120968 - 3 bge0 > 10.2.2.62 9c:93:4e:2d:87:1f UHLc 0 3833 - 3 bge0 > 10.2.2.101 18:60:24:e3:eb:a1 UHLc 0 1872476 - 3 bge0 > 10.2.2.102 18:60:24:e3:f4:80 UHLc 0 5944221 - 3 bge0 > 10.2.2.103 18:60:24:e3:f3:99 UHLc 0 409286 - 3 bge0 > 10.2.2.104 18:60:24:e3:fb:97 UHLc 0 1452694 - 3 bge0 > 10.2.2.105 64:51:06:2b:ba:8b UHLc 0 559768 - 3 bge0 > 10.2.2.106 18:60:24:e3:f1:d2 UHLc 0 150568 - 3 bge0 > 10.2.2.107 64:51:06:2b:74:a3 UHLc 0 406897 - 3 bge0 > 10.2.2.108 18:60:24:e3:e0:63 UHLc 0 1759000 - 3 bge0 > 10.2.2.150 00:0b:82:c1:04:fb UHLc 0 20780 - 3 bge0 > 10.2.2.155 00:0b:82:d0:28:0c UHLc 0 3730 - 3 bge0 > 10.2.2.157 00:0b:82:d0:28:00 UHLc 0 3729 - 3 bge0 > 10.2.2.158 00:0b:82:d2:a9:aa UHLc 0 3729 - 3 bge0 > 10.2.2.255 link#1 UHLc 0 3671 - 3 bge0 > 10.2.4.1 00:16:41:ed:dd:47 UHLl 0 75492 - 1 bge0 > 10.2.4.1/32 10.2.4.1 UCn 0 0 - 4 bge0 > 10.2.4.101 6c:62:6d:93:1e:66 UHLc 1 2203177 - 3 bge0 > 10.2.4.102 c8:60:00:75:f3:d1 UHLc 0 15808 - 3 bge0 > 10.2.4.103 bc:ae:c5:e2:15:eb UHLc 0 95620 - 3 bge0 > 10.2.4.255 link#1 UHLc 0 3635 - 3 bge0 > 10.2.6.1 00:16:41:ed:dd:47 UHLl 0 0 - 1 bge0 > 10.2.6.1/32 10.2.6.1 UCn 0 0 - 4 bge0 > 10.2.255.255 10.2.0.1 UHb 0 1288 - 1 bge0 > x.x.x.108/28 x.x.x.113 UCn 2 362071 - 4 dc0 > x.x.x.109 54:39:69:1f:23:7c UHLch 1 190137 - 3 dc0 > x.x.x.110 00:22:55:69:24:59 UHLc 1 361719 - 3 dc0 > x.x.x.113 00:24:e2:3f:ac:54 UHLl 0 195942 - 1 dc0 > x.x.x.123 x.x.x.113 UHb 0 0 - 1 dc0 > 127/8 127.0.0.1 UGRS 0 0 32768 8 lo0 > 127.0.0.1 127.0.0.1 UHhl 2 149 32768 1 lo0 > 172.17.11.1 00:16:41:ed:dd:47 UHLl 0 1116 - 1 bge0 > 172.17.11.1/32 172.17.11.1 UCn 0 0 - 4 bge0 > > Internet6: > Destination Gateway Flags > Refs Use Mtu Prio Iface > ::/96 ::1 UGRS > 0 0 32768 8 lo0 > ::1 ::1 UHhl > 10 20 32768 1 lo0 > ::ffff:0.0.0.0/96 ::1 UGRS > 0 0 32768 8 lo0 > 2002::/24 ::1 UGRS > 0 0 32768 8 lo0 > 2002:7f00::/24 ::1 UGRS > 0 0 32768 8 lo0 > 2002:e000::/20 ::1 UGRS > 0 0 32768 8 lo0 > 2002:ff00::/24 ::1 UGRS > 0 0 32768 8 lo0 > fe80::/10 ::1 UGRS > 0 0 32768 8 lo0 > fec0::/10 ::1 UGRS > 0 0 32768 8 lo0 > fe80::1%lo0 fe80::1%lo0 UHl > 0 0 32768 1 lo0 > ff01::/16 ::1 UGRS > 0 0 32768 8 lo0 > ff01::%lo0/32 fe80::1%lo0 Um > 0 1 32768 4 lo0 > ff02::/16 ::1 UGRS > 0 0 32768 8 lo0 > ff02::%lo0/32 fe80::1%lo0 Um > 0 1 32768 4 lo0 > fw3# > > -- :wq Claudio
