{ "created": "2015-12-20T19:56:52Z", "hierarchy": [ { "name": "ROOT", "type": "folder", "uri": "/ROOT" }, { "name": "Assigning Fixed Ports to an NIS Server", "type": "article", "uri": "Assigning_Fixed_Ports_to_an_NIS_Server" } ], "html": "\n\n \n \n \n \n \n \n \n \n \n \n \n Assigning Fixed Ports to an NIS Server – Nikhil's Personal Wiki\n \n \n \n \n \n
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Assigning Fixed Ports to an NIS Server\n \n

\n

Configuring Fixed Ports

\n

The motivation is to create better firewalls. You can find out what
\nports your server’s listening on by issuing rpcinfo.

\n
[admin@server ~]# rpcinfo -p\n  program vers proto   port  \n   100000    2   tcp    111  portmapper  \n   100000    2   udp    111  portmapper  \n   100024    1   udp    778  status  \n   100024    1   tcp    781  status  \n   100004    2   udp   1002  ypserv  \n   100004    1   udp   1002  ypserv  \n   100004    2   tcp   1005  ypserv  \n   100004    1   tcp   1005  ypserv  \n   100069    1   udp   1015  fypxfrd  \n   100069    1   tcp   1017  fypxfrd  \n   100009    1   udp    781  yppasswdd  \n   100007    2   udp    958  ypbind  \n   100007    1   udp    958  ypbind  \n   100007    2   tcp    961  ypbind  \n   100007    1   tcp    961  ypbind\n
\n

You can choose a port that’s on that list or come up with your own. I’m
\ngoing to use:

\n\n

Next, configure /etc/sysconfig/network to use these ports. Add this:

\n
YPSERV_ARGS="-p 854"  \nYPXFRD_ARGS="-p 855"\n
\n

Restart the ypserv and ypxfrd services. rpcinfo should now show
\nthe fixed ports:

\n
[admin@server ~]# rpcinfo -p  \n  program vers proto   port  \n   100000    2   tcp    111  portmapper  \n   100000    2   udp    111  portmapper  \n   100024    1   udp    778  status  \n   100024    1   tcp    781  status  \n   100009    1   udp    781  yppasswdd  \n   100007    2   udp    960  ypbind  \n   100007    1   udp    960  ypbind  \n   100007    2   tcp    963  ypbind  \n   100007    1   tcp    963  ypbind  \n   100004    2   udp    854  ypserv\n   100004    1   udp    854  ypserv  \n   100004    2   tcp    854  ypserv  \n   100004    1   tcp    854  ypserv  \n   100069    1   udp    855  fypxfrd\n   100069    1   tcp    855  fypxfrd\n
\n

Sources

\n\n\n\n
\n \n
\n \n \n \n \n \n\n", "id": "2ee4f2d0-ee89-59fe-b596-d4be9ade4d77", "modified": "2026-01-13T18:47:28Z", "revisions": [ { "authorEmail": "mail@nikhil.io", "authorName": "Nikhil Anand", "date": "2026-01-13T18:47:28Z", "id": "2436477560f26e23d00a24add1cbfeafdca4af78", "shortId": "24364775", "subject": "No compression\n", "content": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n [admin@server ~]# rpcinfo -p\n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100004    2   udp   1002  ypserv \n    100004    1   udp   1002  ypserv \n    100004    2   tcp   1005  ypserv \n    100004    1   tcp   1005  ypserv \n 100069    1   udp   1015  fypxfrd \n 100069    1   tcp   1017  fypxfrd \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    958  ypbind \n    100007    1   udp    958  ypbind \n    100007    2   tcp    961  ypbind \n    100007    1   tcp    961  ypbind\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n* Port **854** for **`ypserv`**\n* Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n YPSERV_ARGS=\"-p 854\" \n YPXFRD_ARGS=\"-p 855\"\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n [admin@server ~]# rpcinfo -p \n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    960  ypbind \n    100007    1   udp    960  ypbind \n    100007    2   tcp    963  ypbind \n    100007    1   tcp    963  ypbind \n    100004 2 udp 854 ypserv\n    100004    1   udp    854  ypserv \n    100004    2   tcp    854  ypserv \n    100004    1   tcp    854  ypserv \n 100069 1 udp 855 fypxfrd\n 100069    1   tcp    855  fypxfrd\n\nSources\n-------\n\n* [Securing NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n* [Configuring NIS - LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n" }, { "authorEmail": "mail@nikhil.io", "authorName": "Nikhil Anand", "date": "2025-06-06T14:38:23Z", "id": "c94a7e7ca1fce8cd9c634d81b8b5711166546c9c", "shortId": "c94a7e7c", "subject": "Merge branch 'master' of github.com:afreeorange/wiki.nikhil.io.articles\n", "content": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n [admin@server ~]# rpcinfo -p\n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100004    2   udp   1002  ypserv \n    100004    1   udp   1002  ypserv \n    100004    2   tcp   1005  ypserv \n    100004    1   tcp   1005  ypserv \n 100069    1   udp   1015  fypxfrd \n 100069    1   tcp   1017  fypxfrd \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    958  ypbind \n    100007    1   udp    958  ypbind \n    100007    2   tcp    961  ypbind \n    100007    1   tcp    961  ypbind\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n* Port **854** for **`ypserv`**\n* Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n YPSERV_ARGS=\"-p 854\" \n YPXFRD_ARGS=\"-p 855\"\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n [admin@server ~]# rpcinfo -p \n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    960  ypbind \n    100007    1   udp    960  ypbind \n    100007    2   tcp    963  ypbind \n    100007    1   tcp    963  ypbind \n    100004 2 udp 854 ypserv\n    100004    1   udp    854  ypserv \n    100004    2   tcp    854  ypserv \n    100004    1   tcp    854  ypserv \n 100069 1 udp 855 fypxfrd\n 100069    1   tcp    855  fypxfrd\n\nSources\n-------\n\n* [Securing NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n* [Configuring NIS - LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n" }, { "authorEmail": "mail@nikhil.io", "authorName": "Nikhil Anand", "date": "2021-06-04T03:04:37Z", "id": "fa9f7632d7901e6f9bb62b88594735ccc3588d28", "shortId": "fa9f7632", "subject": "Update Dovecot.md\n", "content": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n [admin@server ~]# rpcinfo -p\n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100004    2   udp   1002  ypserv \n    100004    1   udp   1002  ypserv \n    100004    2   tcp   1005  ypserv \n    100004    1   tcp   1005  ypserv \n 100069    1   udp   1015  fypxfrd \n 100069    1   tcp   1017  fypxfrd \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    958  ypbind \n    100007    1   udp    958  ypbind \n    100007    2   tcp    961  ypbind \n    100007    1   tcp    961  ypbind\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n* Port **854** for **`ypserv`**\n* Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n YPSERV_ARGS=\"-p 854\" \n YPXFRD_ARGS=\"-p 855\"\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n [admin@server ~]# rpcinfo -p \n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    960  ypbind \n    100007    1   udp    960  ypbind \n    100007    2   tcp    963  ypbind \n    100007    1   tcp    963  ypbind \n    100004 2 udp 854 ypserv\n    100004    1   udp    854  ypserv \n    100004    2   tcp    854  ypserv \n    100004    1   tcp    854  ypserv \n 100069 1 udp 855 fypxfrd\n 100069    1   tcp    855  fypxfrd\n\nSources\n-------\n\n* [Securing NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n* [Configuring NIS - LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n" }, { "authorEmail": "mail@nikhil.io", "authorName": "Nikhil Anand", "date": "2015-12-27T07:27:56Z", "id": "1aa29105a45aa67523ffb61e73bcc415f935a47e", "shortId": "1aa29105", "subject": "Fix Markdown conversion\n\nSaw half a season of The Office\n", "content": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n [admin@server ~]# rpcinfo -p\n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100004    2   udp   1002  ypserv \n    100004    1   udp   1002  ypserv \n    100004    2   tcp   1005  ypserv \n    100004    1   tcp   1005  ypserv \n 100069    1   udp   1015  fypxfrd \n 100069    1   tcp   1017  fypxfrd \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    958  ypbind \n    100007    1   udp    958  ypbind \n    100007    2   tcp    961  ypbind \n    100007    1   tcp    961  ypbind\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n* Port **854** for **`ypserv`**\n* Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n YPSERV_ARGS=\"-p 854\" \n YPXFRD_ARGS=\"-p 855\"\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n [admin@server ~]# rpcinfo -p \n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    960  ypbind \n    100007    1   udp    960  ypbind \n    100007    2   tcp    963  ypbind \n    100007    1   tcp    963  ypbind \n    100004 2 udp 854 ypserv\n    100004    1   udp    854  ypserv \n    100004    2   tcp    854  ypserv \n    100004    1   tcp    854  ypserv \n 100069 1 udp 855 fypxfrd\n 100069    1   tcp    855  fypxfrd\n\nSources\n-------\n\n* [Securing NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n* [Configuring NIS - LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n" }, { "authorEmail": "mail@nikhil.io", "authorName": "Nikhil Anand", "date": "2015-12-21T02:30:47Z", "id": "d658e80d1ecb97b196531c7b15a0f9af709c05de", "shortId": "d658e80d", "subject": "Incremental\n", "content": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n` [admin@server ~]# `**`rpcinfo` `-p`** \n`  program vers proto   port` \n`   100000    2   tcp    111  portmapper` \n`   100000    2   udp    111  portmapper` \n`   100024    1   udp    778  status` \n`   100024    1   tcp    781  status` \n`   100004    2   udp   1002  ypserv` \n`   100004    1   udp   1002  ypserv` \n`   100004    2   tcp   1005  ypserv` \n`   100004    1   tcp   1005  ypserv` \n`600100069    1   udp   1015  fypxfrd` \n`600100069    1   tcp   1017  fypxfrd` \n`   100009    1   udp    781  yppasswdd` \n`   100007    2   udp    958  ypbind` \n`   100007    1   udp    958  ypbind` \n`   100007    2   tcp    961  ypbind` \n`   100007    1   tcp    961  ypbind`\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n- Port **854** for **`ypserv`**\n- Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n` YPSERV_ARGS=\"-p 854\"` \n` YPXFRD_ARGS=\"-p 855\"`\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n`[admin@server ~]# rpcinfo -p` \n`  program vers proto   port` \n`   100000    2   tcp    111  portmapper` \n`   100000    2   udp    111  portmapper` \n`   100024    1   udp    778  status` \n`   100024    1   tcp    781  status` \n`   100009    1   udp    781  yppasswdd` \n`   100007    2   udp    960  ypbind` \n`   100007    1   udp    960  ypbind` \n`   100007    2   tcp    963  ypbind` \n`   100007    1   tcp    963  ypbind` \n`   `**`100004` `2` `udp` `854` `ypserv`** \n`   100004    1   udp    854  ypserv` \n`   100004    2   tcp    854  ypserv` \n`   100004    1   tcp    854  ypserv` \n**`600100069` `1` `udp` `855` `fypxfrd`** \n`600100069    1   tcp    855  fypxfrd`\n\nClient-side firewall config\n---------------------------\n\nSources\n-------\n\n- [Securing\n NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n- [Configuring NIS -\n LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n\n\n\n" }, { "authorEmail": "mail@nikhil.io", "authorName": "Nikhil Anand", "date": "2015-12-20T19:56:52Z", "id": "87838b23344cd66554546a3a5561539d48001941", "shortId": "87838b23", "subject": "Assigning Fixed Ports to an NIS Server : First Draft\n", "content": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n` [admin@server ~]# `**`rpcinfo` `-p`** \n`  program vers proto   port` \n`   100000    2   tcp    111  portmapper` \n`   100000    2   udp    111  portmapper` \n`   100024    1   udp    778  status` \n`   100024    1   tcp    781  status` \n`   100004    2   udp   1002  ypserv` \n`   100004    1   udp   1002  ypserv` \n`   100004    2   tcp   1005  ypserv` \n`   100004    1   tcp   1005  ypserv` \n`600100069    1   udp   1015  fypxfrd` \n`600100069    1   tcp   1017  fypxfrd` \n`   100009    1   udp    781  yppasswdd` \n`   100007    2   udp    958  ypbind` \n`   100007    1   udp    958  ypbind` \n`   100007    2   tcp    961  ypbind` \n`   100007    1   tcp    961  ypbind`\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n- Port **854** for **`ypserv`**\n- Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n` YPSERV_ARGS=\"-p 854\"` \n` YPXFRD_ARGS=\"-p 855\"`\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n`[admin@server ~]# rpcinfo -p` \n`  program vers proto   port` \n`   100000    2   tcp    111  portmapper` \n`   100000    2   udp    111  portmapper` \n`   100024    1   udp    778  status` \n`   100024    1   tcp    781  status` \n`   100009    1   udp    781  yppasswdd` \n`   100007    2   udp    960  ypbind` \n`   100007    1   udp    960  ypbind` \n`   100007    2   tcp    963  ypbind` \n`   100007    1   tcp    963  ypbind` \n`   `**`100004` `2` `udp` `854` `ypserv`** \n`   100004    1   udp    854  ypserv` \n`   100004    2   tcp    854  ypserv` \n`   100004    1   tcp    854  ypserv` \n**`600100069` `1` `udp` `855` `fypxfrd`** \n`600100069    1   tcp    855  fypxfrd`\n\nClient-side firewall config\n---------------------------\n\nSources\n-------\n\n- [Securing\n NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n- [Configuring NIS -\n LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n\n[Category:Nikhil's Notes](Category:Nikhil's_Notes \"wikilink\")\n[Category:From a past sysadmin\nlife](Category:From_a_past_sysadmin_life \"wikilink\")\n" } ], "sizeInBytes": 2670, "source": "Configuring Fixed Ports\n-----------------------\n\nThe motivation is to create better firewalls. You can find out what\nports your server's listening on by issuing `rpcinfo`.\n\n [admin@server ~]# rpcinfo -p\n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100004    2   udp   1002  ypserv \n    100004    1   udp   1002  ypserv \n    100004    2   tcp   1005  ypserv \n    100004    1   tcp   1005  ypserv \n 100069    1   udp   1015  fypxfrd \n 100069    1   tcp   1017  fypxfrd \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    958  ypbind \n    100007    1   udp    958  ypbind \n    100007    2   tcp    961  ypbind \n    100007    1   tcp    961  ypbind\n\nYou can choose a port that's on that list or come up with your own. I'm\ngoing to use:\n\n* Port **854** for **`ypserv`**\n* Port **855** for **`ypxfrd`**\n\nNext, configure `/etc/sysconfig/network` to use these ports. Add this:\n\n YPSERV_ARGS=\"-p 854\" \n YPXFRD_ARGS=\"-p 855\"\n\nRestart the `ypserv` and `ypxfrd` services. `rpcinfo` should now show\nthe fixed ports:\n\n [admin@server ~]# rpcinfo -p \n   program vers proto   port \n    100000    2   tcp    111  portmapper \n    100000    2   udp    111  portmapper \n    100024    1   udp    778  status \n    100024    1   tcp    781  status \n    100009    1   udp    781  yppasswdd \n    100007    2   udp    960  ypbind \n    100007    1   udp    960  ypbind \n    100007    2   tcp    963  ypbind \n    100007    1   tcp    963  ypbind \n    100004 2 udp 854 ypserv\n    100004    1   udp    854  ypserv \n    100004    2   tcp    854  ypserv \n    100004    1   tcp    854  ypserv \n 100069 1 udp 855 fypxfrd\n 100069    1   tcp    855  fypxfrd\n\nSources\n-------\n\n* [Securing NIS (RedHat)](http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/security-guide/s1-server-nis.html)\n* [Configuring NIS - LinuxHomeNetwork](http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch30_:_Configuring_NIS)\n", "title": "Assigning Fixed Ports to an NIS Server", "untracked": false, "uri": "/Assigning_Fixed_Ports_to_an_NIS_Server", "relativePath": "Assigning Fixed Ports to an NIS Server.md" }