All Questions
45
questions
1
vote
1
answer
50
views
Why do routing tables and arp tables both require a field of interface?
Routing tables are queried using destination IP of a packet to get the next hop IP and to get the interface to send the packet through.
But since the router will strip the ethernet header first and ...
- 13
2
votes
1
answer
148
views
which protocol is invoked first by routers ? routing (routing table) or ARP?
I have a question regarding the internet layer of the TCP/IP model: When a data frame is sent by a client to a server located on another network, we know that the routing tables and the ARP protocol ...
- 33
1
vote
0
answers
17
views
Does a router need ARP to send data to router in anther netwrk, it already has the IP address of the interface right?why does it need the MAC address? [duplicate]
i am studying off this
https://www.practicalnetworking.net/series/packet-traveling/key-players/#arp
but my question is if ip address is for end to end communication , how is the end to end happening ...
- 11
2
votes
2
answers
130
views
How ARP works [Specific Case]?
After reading about ARP and NAT I'm really confused about putting them to work together.
Let's suppose we have a router A with a public IP of IP(A). Plus, 2 devices behind that router B and C, each ...
- 23
0
votes
1
answer
120
views
How router will send ARP resolve packet when it receive ARP request?
How router will send ARP resolve packet when it receive ARP request ??
Router by default enabled with proxy arp configuration?? If then proxy arp is not configured then what will happen if it receives ...
- 127
4
votes
2
answers
1k
views
Why two routers connected via PPP don't use ARP but Ethernet requires ARP?
I have read from @Ron Maupin's answer of this question that your two routers are connected via PPP (this is not uncommon), ARP will not be used , but if the two routers are connected via ethernet, ...
- 398
0
votes
2
answers
1k
views
What does a router do with a packet if it can't find the destination IP address in its routing table?
If a router receives an ARP request in which the destination hardware address is a broadcast address, and if the destination IP address is an address that the router cannot find in its routing table. ...
0
votes
2
answers
513
views
Why does ARP request not use a router instead of broadcast?
Why in ARP request does the source computer broadcast a message with the destination IP address to find the MAC address of the destination computer? Why doesn't it send the message to the default gate ...
- 107
0
votes
1
answer
100
views
issue regarding broadcast mac address
I read a line saying {Routes do not forward packets coming from one interface having broadcast mac address
(FF:FF:FF:FF:FF:FF)}
what is meant by one interface in that line?
if router cannot broadcast ...
- 31
1
vote
1
answer
285
views
How does router know MAC addresses of computers that are connected to a separate switch? [duplicate]
i am a newbie but i need to understand this ARP thing.
In my company we have a router that has 3 switches connected to it. On the switches there are more than 100 hosts.
I know that switch learns and ...
- 11
3
votes
1
answer
330
views
ARP Router issue
I have a question when a Router receives ARP request to a host that dosen't exists on the forwarding table for that router does the.
And this Router is not the next hop either will the Router continue ...
- 147
1
vote
3
answers
594
views
Why is in all arp table snmp oids an interface index before the ip number?
When I want to get arp information about a single ip number or subnet, I have to snmpwalk the whole arp table, as some oid architects had the "great" idea to always insert an interface index ...
- 11
1
vote
2
answers
154
views
Is the outgoing interface of a router in the same Subnet as the Incoming interface of the NEXT HOP router?
In the TCP/IP Volume 1, it is stated that ARP works only on the same subnet. Does this mean that the outgoing interface of a router is necessarily on the same subnet as the incoming interface of the ...
- 67
0
votes
1
answer
42
views
Who can get ARP packets? [duplicate]
I'm new to networking.
And as far as I understand about ARP messages, Alice can only send ARP to Bob if two are connected.
But if Alice and Bob are connected to a router, but not connected to each ...
- 1
0
votes
2
answers
680
views
ARP-Request - Reply from the perspective of a router
Presume I have a route table with such entries:
typedef struct route_table_entry {
uint32_t prefix;
uint32_t next_hop;
uint32_t mask;
int interface;
} route_table_entry;
I have a ...
- 101